if引导的虚拟语气应该用什么时态？
1. 表示与现在事实相反的情况，其句型为“ if+ 主语 + 动词的过去式（ be 动词用 were ），主语 +would / could / might / should + 动词原形”。如：If the weather were fine, we would go to Shanghai.
如果天气好，我们就去上海。（事实上天气不好）
If they had time, they would / could / might go with me.
如果他们有时间，他们就会（可能）和我一起去。
2. 表示与过去事实相反的情况。其句型为“ if + 主语 + 动词的过去完成式，主语 +would / could / should / might + have + 动词的过去分词”。如：
If I had taken his advice, I shouldn't / wouldn't / couldn't have made such a mistake.
如果我按照他的建议去做，我一定不会（不可能）犯这样的错误。
3. 表示与将来事实可能相反的假设和结果，其句型为“ if + 主语 + 动词的过去式 / should + 动词原形 / were to +动词原形，主语 +would / could / might / should + 动词原形”。如：
The glass would break if you dropped it.
杯子摔下来会打破的。（事实上没有摔下来）
If it should rain, the crops would / could / might be saved.
假如天下雨，庄稼就一定（有可能）会得救。
1、对现在情况的假设：表示说话时不存在或与事实相反的情况.形式：If+主语+did,主语+should/ would /could +do.例句：If you knew english well,you would be able to talk with foreigners freely.
2、对过去情况的假设：表示与过去事实相反的情况.形式：if+主语+had done,主语+should/would /could+have done.例句：if i had not studied hard ,i might have failed in the exam.（事实是我通过考试了）
3、对将来情况的假设：表示将来实现可能性不大的情况.形式：if+主语+did/were to do /should do,主语+should /would /could do.例句:if he should change his mind ,what would we do?
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绛旓細濡傛灉褰撴椂鍚垜鐨勫姖锛屼綘鐜板湪灏变笉浼氭湁楹荤儲浜嗐(if 鏉′欢鍙ユ槸瀵硅繃鍘荤殑铏氭嫙锛屾晠鐢ㄨ繃鍘诲畬鎴愭椂锛岃屼富鍙ユ槸瀵圭幇鍦ㄧ殑铏氭嫙锛屾晠鐢ㄢ渨ould+鍔ㄨ瘝鍘熷舰鈥濆舰寮忥級2銆佸惈钃勬潯浠跺彞 鏈変簺鍙ュ瓙铏戒笉鍚潯浠朵粠鍙ワ紝浣嗘剰鎬濆拰鏉′欢鍙ョ浉宸笉澶氾紝杩欑鍙ュ瓙绉颁负鈥滃惈钃勬潯浠跺彞鈥濓紝杩欑鍙ュ瓙鏈夋椂鍊欎細鐢ㄨ櫄鎷熻姘斻傚: Without air (If there...
绛旓細1. 琛ㄧず涓庣幇鍦ㄤ簨瀹炵浉鍙嶇殑鎯呭喌锛屽叾鍙ュ瀷涓衡 if+ 涓昏 + 鍔ㄨ瘝鐨勮繃鍘诲紡锛 be 鍔ㄨ瘝鐢 were 锛夛紝涓昏 +would / could / might / should + 鍔ㄨ瘝鍘熷舰鈥濄傚锛If the weather were fine, we would go to Shanghai.濡傛灉澶╂皵濂斤紝鎴戜滑灏卞幓涓婃捣銆傦紙浜嬪疄涓婂ぉ姘斾笉濂斤級If they had time, they would / ...
绛旓細铏氭嫙璇皵鐨勪笁绉嶆椂鎬佹槸锛氳櫄鎷熻姘旂幇鍦ㄦ椂銆佽櫄鎷熻姘旇繃鍘绘椂銆佽櫄鎷熻姘斿皢鏉ユ椂銆傝櫄鎷熻姘旂幇鍦ㄦ椂鐢ㄤ簬琛ㄨ揪褰撳墠鐘舵佷笅鐨勫亣璁炬儏鍐垫垨涓庣幇瀹炵浉鍙嶇殑浜嬪疄銆傝繖涓椂鎬佷笅锛屼笉璁烘槸鍦ㄩ檲杩板彞涓繕鏄湪鏉′欢鐘惰浠庡彞涓紝铏氭嫙璇皵閫氬父浣撶幇鍦ㄨ皳璇笂銆傛瘮濡傚湪琛ㄨ揪褰撳墠鍋囪鐨勬儏鍐垫椂锛屼粠鍙ョ殑璋撹褰㈠紡浼氶噰鐢“should + 鍔ㄨ瘝鍘熷舰”...
绛旓細鏉′欢鍙ユ彁鍓嶄竴涓椂鎬侊紝骞跺彇娑堜笁鍗曞舰寮忥紝涓诲彞鍒欏姞would if I were you, I would go there 濡傛灉鎴戞槸浣狅紝鎴戝氨鍘婚偅閲屻俰f I had been there, I would have known the result.濡傛灉鎴戝幓杩囬偅閲岋紝鎴戝簲璇ュ凡缁忕煡閬撶粨鏋滀簡
绛旓細瀵瑰皢鏉ヨ繘琛屽亣璁句富瑕佹湁涓夌鎯呭喌锛1,if鏉′欢浠庡彞鏄皳璇敤鍔ㄨ瘝杩囧幓寮,鍒欏悗闈㈢殑涓诲彞鏄儏鎬佸姩璇嶅姞鍔ㄨ瘝鍘熷舰 渚嬶細If I came tomorrow ,we would have the meeting.2,if鏉′欢浠庡彞鏄痺ere to褰㈠紡,鍒欏悗闈㈢殑涓诲彞涔熸槸鎯呮佸姩璇嶅姞鍔ㄨ瘝鍘熷舰 渚嬶細If it were to rain tomorrow ,the meting would be put off.3,if鏉′欢...
绛旓細铏氭嫙璇皵if鐨勭敤娉1銆佺幇鍦ㄦ椂锛氬綋if寮曞鐨勮櫄鎷熻姘琛ㄧず涓庣幇鍦ㄤ簨瀹炵浉鍙嶆椂锛屼富鍙ヨ皳璇敤could銆亀ould銆乻hould鎴杕ight鍔犲姩璇嶅師褰紝鏉′欢浠庡彞涓殑璋撹鐢ㄨ繃鍘诲紡銆傚锛欼f we walk faster,we can get there earlier.濡傛灉鎴戜滑璧板揩涓鐐癸紝灏辫兘鏃╃偣鍒拌揪閭ｉ噷銆2銆佽繃鍘绘椂锛氬綋if寮曞鐨勮櫄鎷熻姘旇〃绀轰笌杩囧幓浜嬪疄鐩稿弽鏃讹紝涓诲彞...
绛旓細鏃舵佸簲璇ユ槸涓诲皢浠庣幇锛屽氨鏄涓诲彞鐢ㄤ竴鑸皢鏉ユ椂锛岃屼粠鍙ョ敤涓鑸幇鍦ㄦ椂琛ㄧず灏嗘潵銆備緥濡 If it doesn't rain tomorrow, I will visit my former school.杩欓噷浠庡彞灏辩敤涓鑸幇鍦ㄦ椂銆傚綋鐒if寮曞鐨浠庡彞涔熷彲浠ョ敤铏氭嫙璇皵 渚嬪If I got up early in the morning, I wouldn't miss the train.
绛旓細1銆佹彁鍑哄皢鏉ヤ細鍙戠敓鐨勪簨锛氫富鍙ワ細涓昏锛媤ould/should/might/could锛嬪姩璇嶅師褰紱浠庡彞锛歴hould锛嬪姩璇嶅師褰/were to锛嬪姩璇嶅師褰紱2銆佹彁鍑虹幇鍦ㄧ殑鏉′欢锛 涓诲彞锛氫富璇紜would/should/might/could锛嬪姩璇嶅師褰紱浠庡彞锛氬姩璇嶈繃鍘诲紡锛涗緥鍙ワ細If he studied at this school, he would know the enviornment around the school ...
