英语中虚拟语气用法太广了，特别是在从句中，不知道什么时候该省略would/should/could/might这些词，做选 虚拟语气中什么时候才用WOULD而什么时候不用？
\u8bf7\u95ee\u865a\u62df\u8bed\u6c14\u4e2d\u7684should\u5728\u4ec0\u4e48\u60c5\u51b5\u4e0b\u53ef\u4ee5\u7701\u7565\uff0c\u8c22\u8c22\u9ad8\u4e2d\u82f1\u8bed\u77e5\u8bc6\uff0c\u4ed6\u547d\u4ee4\u628a\u8fd9\u4e2a\u623f\u5b50\u5356\u4e86\uff0c\u865a\u62df\u8bed\u6c14\u4e2dshould\u88ab\u7701\u7565\u7684\u60c5\u51b5
\u638c\u63e1\u865a\u62df\u8bed\u6c14\uff0c\u6700\u57fa\u672c\u7684\u662f\u638c\u63e1\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\u4e2d\u7684\u865a\u62df\u8bed\u6c14\uff0c\u800c\u5176\u57fa\u672c\u5219\u662f\u4ee5\u4e0b\u4e09\u4e2a\u865a\u62df\u8bed\u6c14\u7684\u57fa\u672c\u7ed3\u6784
\u2460\u8868\u793a\u4e0e\u73b0\u5728\u4e8b\u5b9e\u76f8\u53cd\u7684\u60c5\u51b5
\u4ece\u53e5\u8c13\u8bed\u52a8\u8bcd\u5f62\u5f0f \u8c13\u8bed\u52a8\u8bcd\u7528\u4e00\u822c\u8fc7\u53bb\u5f0f
\u4e3b\u53e5\u8c13\u8bed\u52a8\u8bcd\u5f62\u5f0f \uff08be\u7528were\uff09 should/would+\u52a8\u8bcd\u539f\u5f62\uff08\u8fc7\u53bb\u5c06\u6765\u65f6\uff09
\u2461\u8868\u793a\u4e0e\u8fc7\u53bb\u4e8b\u5b9e\u76f8\u53cd\u7684\u60c5\u51b5
\u4ece\u53e5\u8c13\u8bed\u52a8\u8bcd\u5f62\u5f0f had+\u8fc7\u53bb\u5206\u8bcd\uff08\u8fc7\u53bb\u5b8c\u6210\u65f6\uff09
\u4e3b\u53e5\u8c13\u8bed\u52a8\u8bcd\u5f62\u5f0f should/would+have+\u8fc7\u53bb\u5206\u8bcd\uff08\u73b0\u5728\u5b8c\u6210\u5c06\u6765\u65f6\uff09\uff08\u8fc7\u53bb\u5c06\u6765\u5b8c\u6210\u65f6\uff09
\u2462\u8868\u793a\u5bf9\u5c06\u6765\u60c5\u51b5\u7684\u4e3b\u89c2\u63a8\u6d4b\uff08\u53ef\u80fd\u76f8\u53cd\u6216\u53ef\u80fd\u6027\u5f88\u5c0f\uff09
\u4ece\u53e5\u8c13\u8bed\u52a8\u8bcd\u5f62\u5f0f If+\u4e3b\u8bed+ \u2460 should+\u52a8\u8bcd\u539f\u5f62 \u2461 \u8c13\u8bed\u7528\u52a8\u8bcd\u8fc7\u53bb\u5f0f \u2462were to do
\u4e3b\u53e5\u8c13\u8bed\u52a8\u8bcd\u5f62\u5f0f A:should/would+\u52a8\u8bcd\u539f\u5f62 B:\u7948\u4f7f\u53e5
\u6ce8\uff1a
1.\u6211\u8ba4\u4e3a\u4ee5\u4e0a\u4e3b\u53e5\u4e2d\u7684\u60c5\u6001\u52a8\u8bcd\u90fd\u4e0d\u53ef\u7701\u3002
2.\u53e5\u4e2d\u7684should\u901a\u5e38\u7528\u4e8e\u7b2c\u4e00\u4eba\u79f0\uff0cwould\u53ef\u7528\u4e8e\u4efb\u4f55\u4eba\u79f0\uff0c\u540c\u65f6\u4e5f\u53ef\u6839\u636e\u610f\u601d\u7528\u60c5\u6001\u52a8\u8bcdcould\uff08\u8868\u793a\u53ef\u4ee5\uff09,might\uff08\u8868\u793a\u53ef\u80fd\uff09\uff08can,may\u4e00\u822c\u4e0d\u7528\u5728\u865a\u62df\u8bed\u6c14\u4e2d\uff09
3.\u2462\u4e2d\u4ece\u53e5\u7ed3\u6784were to do\u6bd4should+\u52a8\u8bcd\u539f\u5f62 \u53ef\u80fd\u6027\u5c0f
4.\u4e0e\u5c06\u6765\u4e8b\u5b9e\u76f8\u53cd\u7684\u53e5\u4e2d\uff0c\u53ea\u6709\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\u7528should\u65f6\u4e3b\u53e5\u624d\u80fd\u7528B\u5f0f\u7684\u7948\u4f7f\u53e5\u3002
\u61c2\u5f97\u4e86\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\u7684\u865a\u62df\uff0c\u5c31\u53ef\u4ee5\u63a8\u53ca\u8bb8\u591a\u7684\u865a\u62df\u8bed\u6c14\u65b9\u9762\u7684\u77e5\u8bc6\uff0c\u5176\u4e2d\u6d89\u53ca\u5230\u60c5\u6001\u52a8\u8bcd\u7684\u5f52\u7eb3\u5982\u4e0b\uff08\u53ef\u80fd\u4e0d\u5b8c\u6574\uff09
1.\u5728\u8868\u793a\u5efa\u8bae\u3001\u8bf7\u6c42\u3001\u4e3b\u5f20\u3001\u8981\u6c42\u3001\u547d\u4ee4\u7b49\u8bcd\u8bed\u540e\u7684\u4ece\u53e5\u8981\u7528\u201cshould+\u52a8\u8bcd\u539f\u5f62\u201d\uff0cshould\u53ef\u4ee5\u7701\u7565\u3002\uff08\u6211\u8ba4\u4e3a\u8fd9\u65f6\u53ea\u80fd\u7528should\uff0c\u4e0d\u80fd\u7528\u5176\u5b83\u7684\u60c5\u6001\u52a8\u8bcd\uff09
2.\u5728\u4e3b\u8bed\u4ece\u53e5\u4e2d\uff0c\u8c13\u8bed\u52a8\u8bcd\u7684\u865a\u62df\u8bed\u6c14\u7ed3\u6784\u7528\u201c\uff08should)+\u52a8\u8bcd\u539f\u5f62\u201d\u7684\u7ed3\u6784\uff0c\u8868\u793a\u60ca\u5947\u3001\u4e0d\u76f8\u4fe1\u3001\u60cb\u60dc\u3001\u7406\u5e94\u5982\u6b64\u7b49\u3002\u8fd9\u65f6should\u610f\u4e3a\u201c\u5e94\u8be5\u201d\u3001\u201c\u7adf\u7136\u201d\uff0c\u53ef\u4ee5\u7701\u53bb\uff0c\u4f46\u4e0d\u53ef\u6362\u7528would\u3002
3.\uff08\u8fd9\u70b9\u76f8\u5f53\u590d\u6742\uff0c\u6211\u90fd\u8fd8\u6ca1\u5f04\u6e05\u695a\uff0c\u5176\u4e2d\u6d89\u53ca\u5230\u7684\u4e0d\u6b62\u60c5\u6001\u52a8\u8bcd\u5185\u5bb9\uff0c\u6211\u8ba4\u4e3a\u633a\u6709\u610f\u601d\uff0c\u5168\u6253\u51fa\u6765\u4e86\uff0c\u5c31\u5f53\u4e00\u4e2a\u4e86\u89e3\u5427\uff09
It is time + we went to bed.\uff08\u7528\u8fc7\u53bb\u5f0f\uff09
we were going to bed.\uff08\u7528\u8fc7\u53bb\u8fdb\u884c\u65f6\uff09
we should go to bed.(should\u52a0\u52a8\u8bcd\u539f\u5f62\uff09
\u201cIt is (high) time (that) ...\u201d\u610f\u4e3a\u201c\uff08\u73b0\u5728\uff09\u8be5\u2026\u2026\u201d\uff0c\u542b\u6709\u5efa\u8bae\u7684\u610f\u5473\u3002\u8868\u793a\u73b0\u5728\u6216\u5c06\u6765\uff0c\u4ece\u53e5\u7684\u8c13\u8bed\u52a8\u8bcd\u591a\u7528\u8fc7\u53bb\u5f0f\u6216\u8fc7\u53bb\u8fdb\u884c\u65f6\u6001\u3002\u5728I/He/She/It\u540e\u4e00\u822c\u4e0d\u7528were\uff0c\u8981\u7528was\u3002\u6709\u65f6\u4ea6\u53efshould+\u52a8\u8bcd\u539f\u5f62\uff0c\u4f46should\u4e0d\u80fd\u7701\u7565\uff08\u5982\u679c\u7701\u7565\u4e86\uff0c\u53d8\u6210\u4ece\u53e5\u7528\u4e00\u822c\u73b0\u5728\u65f6\uff0c\u662f\u4e0d\u5141\u8bb8\u7684\uff09\u3002\u6709\u65f6\u53ef\u7528could,\u4f46\u4e0d\u80fd\u7528would\u3002
It is (high) time we left(should leave).
It is high time I was going.
It is about time your baby could walk.
\u8bf4\u660e\uff1aIt's time\u540e\u4e0d\u63a5\u5426\u5b9a\u53e5\u3002\u56e0\u6b64\u201cIt's high time we didn't stay.\u201d\u662f\u4e2a\u9519\u53e5\uff0c\u53ef\u6539\u4e3a\u201cIt's high time we left\u201d\u201cIt's time (for sb.) to do sth.\u201d\u662f\u4e2a\u5e38\u7528\u53e5\u578b\u3002
4.\u5f53wish\u7684\u4e3b\u8bed\u5c31\u662f\u5bbe\u8bed\u4ece\u53e5\u7684\u4e3b\u8bed\u65f6\uff0c\u5bbe\u8bed\u4ece\u53e5\u4e2d\u5e94\u6539\u7528\uff08could)
I wish I could be (\u4e0d\u7528would be) more energetic.
\u697c\u4e3b\u8bf4\u5206\u4e0d\u6e05\u5bf9\u5c06\u6765\u865a\u62df\u4e0e\u73b0\u5728\u865a\u62df\uff0c\u5e94\u8be5\u662f\u6307\u7528\u6cd5\u4e0a\u9762\u5427\u3002\u5176\u5b9e\u4e24\u8005\u662f\u6709\u76f8\u540c\u4e4b\u5904\u7684\uff1a1.\u4ece\u53e5\u90fd\u53ef\u4ee5\u7528\u4e00\u822c\u8fc7\u53bb\u5f0f\u865a\u62df\uff1b2.\u4e3b\u53e5\u90fd\u53ef\u4ee5\u662fshould/would+\u52a8\u8bcd\u539f\u5f62\u3002\u5f53\u7136\u8fd8\u662f\u6709\u533a\u522b\u7684\uff0c\u5982\u4e0b\uff1a
1.\u4ece\u53e5\u65b9\u9762\uff1a\u5bf9\u5c06\u6765\u7684\u865a\u62df\u53ef\u4ee5\u7528should+\u52a8\u8bcd\u539f\u5f62\uff0c\u5bf9\u73b0\u5728\u7684\u4e0d\u884c
2.\u4e3b\u53e5\u65b9\u9762\uff1a\u5bf9\u5c06\u6765\u7684\u865a\u62df\u53ef\u4ee5\u6709were to do\u7ed3\u6784\uff08\u524d\u63d0\u662f\u4e3b\u53e5\u662fshould+\u52a8\u8bcd\u539f\u5f62\uff09\uff0c\u5bf9\u73b0\u5728\u7684\u4e0d\u884c\u3002
\u7efc\u4e0a\u4e24\u70b9\uff0c\u5bf9\u73b0\u5728\u7684\u865a\u62df\u7ed3\u6784\u8f83\u5355\u4e00
\u82e5\u697c\u4e3b\u662f\u6307\u65f6\u6001\u5224\u65ad\u4e0d\u6e05\u695a\uff0c\u90a3\u5c31\u662f\u65f6\u6001\u95ee\u9898\u4e86\u3002\u65f6\u6001\u662f\u4e0e\u865a\u62df\u8bed\u6c14\u5173\u7cfb\u5bc6\u5207\u7684\u76f8\u5173\u8bed\u6cd5\u77e5\u8bc6\uff0c\u552f\u6709\u719f\u7ec3\u638c\u63e1\u65f6\u6001\uff0c\u624d\u80fd\u638c\u63e1\u597d\u865a\u62df\u8bed\u6c14\u3002\u56e0\u6b64\u53ea\u80fd\u81ea\u5df1\u518d\u53bb\u590d\u4e60\u65f6\u6001\u4e86
\u554a~~~~~\u5f88\u6709\u6210\u5c31\u611f
根据你的问题would/should/could/should，此四个情态动词属于倒退时态的范围，而你所表述的省略的是（should）+动词原形的范围。在方向1中，无论是主句还是从句都不存在省略的情况；在方向2中，只能使用should+动词原形，should是可以省略的，这样一来就只剩下动词原形了。
其次，简单讲一下你究竟如何判断用方向1还是方向2.
方向1这种虚拟语气主要应用于条件状语从句、与条件状语从句相关的简单句、方式状语从句、宾语从句和定语从句。也许你分不清楚，建议你好好问问老师。
倒退时态的基本原理：虚拟语气表示事件发生的几率很低，几乎为0，所以不能与真实发生的事件用相同时态。正常应该用现在时的——过去时；正常应该用将来时的——过去时；正常过去时的——过去完成时。（所以称为倒退）
现在要告诉你的是最经常考的条件状语从句长什么样。简单说，就是带if的句子。这类句子我们会译为“如果A……，B就会/就能/就应该/或许会……”，从汉语中我们发现主句，也就是没有if那一句的“就会/就能/就应该/或许会”需要用英语的情态动词去表示。但是由于你在用虚拟语气，因此要求倒退，情态动词中只有4个过去时，即，would/should/could/should，所以你就必须在这种情况下选这类的。
方向2的虚拟语气比1简单，应用于名词性从句：主语从句，表语从句，同位语从句和宾语从句。也许你分不清楚。那么你就记住，大多数情况下你看见一个从句中有下列单词，而且选项又是虚拟语气的选项，那么基本上是在考你（should）+动词原形。单词有：建议suggest, advise,propose；命令order；要求request, require, demand, command；坚持insist。（以上单词无论是动词形式还是名词形式，甚至是形容词形式都适用。）
虚拟语气不是以上所说的那么少，还有很多细节，如有问题，请追问。
if从句后面不带情态动词，主句中要加情态动词
表现在的虚拟条件句
从句：用动词过去（be 多用were ）
1. If I were you, I should study
English.
2. I would certainly go if I
had time.
主句：would/should/could/might+动词原形
表过去的虚拟条件句
从句：had + PP
1. If you had taken my advice, you would not
have failed in the test.
2. If I had left a little earlier, I would
have caught the train.
主句：would/should/could/might +have + PP
表将来的虚拟条件句
从句：①用动词过去②should +V原③（were +to do ）
1. If it were to rain tomorrow, the meeting
would be put off.
2. If you came tomorrow, we would
have the meeting.
主句：would/should/could/might +have + PP
这个属于语感，只要考时间来磨练。
多听英语磁带，多看英文原版电影（无字幕），多连口语。
假以时日，即可练成。
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绛旓細Mustn't have done 鐢ㄦ硶涓嶆纭,瀵硅繃鍘诲彂鐢熺殑浜嬫儏杩涜鍚﹀畾鎬ф帹鏂簲涓篶ouldn't have done, "涓嶅彲鑳藉凡缁"銆 must not do 涓嶅彲浠(鐢ㄤ簬涓鑸幇鍦ㄦ椂)銆 璇皵鏄竴绉嶅姩璇嶅舰寮,鐢ㄤ互琛ㄧず璇磋瘽鑰呯殑鎰忓浘鎴栨佸害銆铏氭嫙璇皵琛ㄧず璇磋瘽鑰呯殑涓昏鎰挎湜銆佸亣鎯冲拰寤鸿绛,鎵璇寸殑璇濇湁鐨勪笌鐜板湪浜嬪疄鐩稿弽,鎴栦笌杩囧幓浜嬪疄鐩稿弽,鎴栦笌灏嗘潵浜嬪疄鐩稿弽鎴...
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绛旓細涓嶆槸锛寃ould鍙互鐪佺暐
绛旓細璇ュ彞鍨嬭〃杈剧殑鎰忔濇槸涓绉嶆湡鏈涘彂鐢熺殑浜嬫儏锛屾墍浠ヨ鐢铏氭嫙璇皵銆傚浐瀹鐢ㄦ硶璋堜笉涓婁粈涔堝巻鍙叉牴婧愶紝鍙槸涓绉嶈娉曚笂鐨勫浐瀹氳〃鐜板舰寮忚屽凡銆鑻辫锛氳嫳璇槸涓绉嶈タ鏃ヨ虫浖璇敮锛屾渶鏃╄涓笘绾殑鑻卞浗浣跨敤锛骞跺洜鍏跺箍闃旂殑娈栨皯鍦拌屾垚涓轰笘鐣屼娇鐢ㄩ潰绉渶骞跨殑璇█銆傝嫳鍥戒汉鐨勭鍏堢泿鏍奸瞾閮ㄨ惤鏄悗鏉ヨ縼绉诲埌澶т笉鍒楅宀涘湴鍖虹殑鏃ヨ虫浖閮ㄨ惤涔嬩竴锛...
绛旓細璇皵鏄敤鏉ヨ〃绀鸿璇濊呯殑鎰忓浘鍜屾佸害鐨勩傚敖绠鑻辫涓鏈夐檲杩拌姘(indicative mood)銆佺浣胯姘(imperative mood)銆铏氭嫙璇皵(subjective mood)锛屼絾鏄櫄鎷熻姘旀槸鍚勭鑻辫鑰冭瘯涓冨療鏈澶氱殑涓绉嶃傝櫄鎷熻姘斿湪鑻辫閲涓昏鐢ㄦ潵琛ㄨ揪锛1.闈炵湡瀹炵殑鎯呮櫙锛屼笉鍙兘鍙戠敓鐨勪簨锛屽嵆鏌愮涓庝簨瀹炵浉鍙嶆垨闅句互瀹炵幇鐨勬儏鍐碉紝鎴栬璇濅汉鐨勪富瑙...
绛旓細鑰冭瘯鐨勯噸鐐规湁鏉′欢銆佹椂闂淬佽姝ョ姸璇粠鍙ヤ腑鐢ㄧ幇鍦ㄦ椂琛ㄧず灏嗘潵鏃剁殑姒傚康;瀹捐浠庡彞涓殑鏃舵;涓鑸繃鍘绘椂銆佺幇鍦ㄥ畬鎴愭椂銆佽繃鍘诲畬鎴愭椂銆佸皢鏉ュ畬鎴愭椂绛夋椂鎬鐨勭敤娉銆2.鎯呮佸姩璇 杩欓儴鍒嗚冭瘯閲嶇偣鏄湁鎯呮佸姩璇嶆帴瀹屾垚鏃;鎯呮佸姩璇嶈〃鎺ㄦ祴鐨勭壒娈婄敤娉曘3.铏氭嫙璇皵 鏈儴鍒嗙殑鑰冭瘯閲嶇偣鍖呮嫭铏氭嫙璇皵鐨鍊掕缁撴瀯銆侀敊缁兼椂闂存潯浠跺彞銆佸惈钃...
绛旓細even if鏈夋椂杩樺彲鐢ㄤ簬铏氭嫙璇皵锛涜繖鏍风敤鐨別ven if涓庡崟鐙浣跨敤鐨if姣旇緝鎺ヨ繎銆備緥锛欵ven if he had the money,he wouldn't buy it.浠栧嵆浣挎湁閽变篃涓嶄細涔板畠銆傝繖鏍风敤鐨別ven though涓巘hough鎴朼lthough鐨勬剰鎬濇瘮杈冩帴杩戯紝璁稿鏃跺欏彲浠ヤ簰鎹備緥锛欵ven though[Thought,Although]I felt sorry for him,l was secretly...
绛旓細绗竴涓猘s鏄浉褰撲簬when鐨勭敤娉曪紝鐢ㄦ椂闂村钩姝ワ紝涔熷氨鏄袱浠朵簨鏄湪鐩稿悓鏃堕棿鍙戠敓鐨勬剰鎬濓紱绗簩涓猘s灏辨槸浣滀负銆佸綋鐨勬剰鎬濓紝涔熷氨鏄褰撲綘鍦ㄥ共鍢涚殑鎰忔濄
