英语问题：为什么情态动词can的后面要跟to？下面是我的资料书上的两个句子。我搞不懂，只好请教各位大... will后面加动词原形，还是ing形式？
\u4e00\u822c\u7591\u95ee\u53e5\u7528may.\u548cmust\u63d0\u95ee\u7684\uff0c\u80af\u5b9a\u56de\u7b54\u548c\u5426\u5b9a\u56de\u7b54\u5404\u662f\u4ec0\u4e48\uff1f\u8be6\u7ec6\u4e00\u70b9\u3002\u8c22\u8c22\u3002\u4e00\u822c\u8bf4\u6765\uff0c\u4ee5must\u5f15\u51fa\u7684\u4e00\u822c\u7591\u95ee\u53e5\uff0c\u5176\u80af\u5b9a\u56de\u7b54\u7528must\uff0c\u8868\u793a\u201c\u5fc5\u987b\u3001\u5fc5\u8981\u201d\uff1b\u5176\u5426\u5b9a\u56de\u7b54\u901a\u5e38\u662f\u7528 needn't\uff08=don't have to\uff09\uff0c\u8868\u793a\u201c\u4e0d\u5fc5\u201d\u3002\u4f8b\u5982\uff1a-Must I come today\uff1f\u6211\u4eca\u5929\u5fc5\u987b\u8fc7\u6765\u5417\uff1f-Yes\uff0cyou must.\u662f\u7684\uff0c\u5fc5\u987b\u8fc7\u6765\u3002-No, you needn't.\u4e0d\uff0c\u4e0d\u5fc5\u8fc7\u6765\u3002May\u5f15\u8d77\u7684\u4e00\u822c\u7591\u95ee\u53e5\uff0c\u8868\u793a\u8bf7\u6c42\u548c\u5141\u8bb8\u3002\u80af\u5b9a\u7528can\uff0c\u5426\u5b9a\u7528mustn't\u6216\u8005can't\uff0c\u8868\u793a\u201c\u4e0d\u53ef\u4ee5\uff0c\u7981\u6b62\u201d\u4f8b\u5982\uff1aMay I smoke in this room?\u6211\u53ef\u4ee5\u5728\u8fd9\u4e2a\u623f\u95f4\u62bd\u70df\u5417\uff1fYes, you can.\u662f\u7684\uff0c\u53ef\u4ee5\u3002No, you can't.\u4e0d\uff0c\u4e0d\u53ef\u4ee5\u3002
\u62d3\u5c55\u8d44\u6599\uff1a
\u4e00\u822c\u7591\u95ee\u53e5\u6709\u4e24\u4e2a\u5bb6\u65cf\u3002
\u7b2c\u4e00\u5bb6\u65cf\u4e3a\u542bbe\u52a8\u8bcd\u6216\u60c5\u6001\u52a8\u8bcd\u7684\u4e00\u822c\u7591\u95ee\u53e5\uff0c\u5176\u7ed3\u6784\u4e3a\uff1a
be + \u4e3b\u8bed + \u5176\u5b83\u90e8\u5206\uff1f
\u60c5\u6001\u52a8\u8bcd + \u4e3b\u8bed + \u52a8\u8bcd\u539f\u5f62 + \u5176\u5b83\u90e8\u5206\uff1f
\u80af\u5b9a\u56de\u7b54\u7528\u201cYes\uff0c\u4e3b\u8bed+be\\u60c5\u6001\u52a8\u8bcd.\u201d\uff0c\u5426\u5b9a\u56de\u7b54\u7528\u201cNo\uff0c\u4e3b\u8bed+be\\u60c5\u6001\u52a8\u8bcd+not.\u201d\u3002be\u6216\u60c5\u6001\u52a8\u8bcd\u548cnot\u53ef\u7528\u7f29\u5199\u5f62\u5f0f\uff0c\u4e3b\u8981\u6709isn\u2019t\uff0caren\u2019t\uff0cwasn\u2019t\uff0cweren\u2019t\uff0ccan\u2019t\uff0cmustn\u2019t\uff0cneedn\u2019t\u7b49\u3002
Eg1. \u95ee\u53e5\uff1a Is this your English book\uff1f\u80af\u7b54\uff1a Yes\uff0cit is.\u5426\u7b54\uff1a No\uff0cit isn`t.
Eg2. \u95ee\u53e5\uff1a Are these your English books\uff1f\u80af\u7b54\uff1a Yes\uff0cthey are.\u5426\u7b54\uff1a No\uff0cthey aren\u2019t.
Eg3. \u95ee\u53e5\uff1a Can you speak English?\u80af\u7b54\uff1a Yes\uff0cI can.\u5426\u7b54\uff1a No\uff0cI can\u2019t.
\u6ce8\u610f\u4f8b\u53e51\u548c\u4f8b\u53e52\uff0c\u5728\u56de\u7b54\u65f6\u5fc5\u987b\u5c06this\that\u4e0ethese\those\u5206\u522b\u53d8\u4e3ait\u548cthey\u3002
\u53e6\u4e00\u5bb6\u65cf\u4e3a\u542b\u884c\u4e3a\u52a8\u8bcd\uff08\u6216\u79f0\u4e3a\u5b9e\u4e49\u52a8\u8bcd\uff09\u7684\u4e00\u822c\u7591\u95ee\u53e5\uff0c\u5176\u7ed3\u6784\u4e3a\uff1a
\u52a9\u52a8\u8bcd + \u4e3b\u8bed + \u52a8\u8bcd\u539f\u5f62 + \u5176\u5b83\uff1f
\u80af\u5b9a\u56de\u7b54\u7528\u201cYes, \u4e3b\u8bed+ do\does.\u201d\uff0c\u5426\u5b9a\u56de\u7b54\u7528\u201cNo, \u4e3b\u8bed+do\does not.\u201d\u3002\u52a9\u52a8\u8bcd\u4e5f\u5e38\u7528\u7f29\u5199\u5f62\u5f0f\uff0c\u4e3b\u8981\u6709don\u2019t\uff0cdoesn\u2019t\uff0cdidn\u2019t\u7b49\u3002
Eg4. \u95ee\u53e5\uff1a Do your parents like English\uff1f\u80af\u7b54\uff1a Yes\uff0cthey do.\u5426\u7b54\uff1a No\uff0cthey don\u2019t.
\u4e00\u822c\u7591\u95ee\u53e5\u7684\u56de\u7b54
\u6b63\u5982\u524d\u9762\u6240\u8ff0\uff0c\u56de\u7b54\u4e00\u822c\u7591\u95ee\u53e5\u65f6\u6709\u80af\u5b9a\u56de\u7b54\u548c\u5426\u5b9a\u56de\u7b54\u4e24\u79cd\u65b9\u5f0f\uff0c\u80af\u5b9a\u56de\u7b54\u4ee5Yes\u8d77\u53e5\uff0c\u5426\u5b9a\u56de\u7b54\u7528No\u5f00\u5934\u3002\u4f46\u5bf9\u4e00\u822c\u7591\u95ee\u53e5\u7684\u56de\u7b54\u4e5f\u4e0d\u662f\u4e00\u6210\u4e0d\u53d8\u7684\u3002\u80af\u5b9a\u56de\u7b54\u8fd8\u53ef\u4ee5\u7528OK./Certainly.\u7b49\uff1b\u5426\u5b9a\u56de\u7b54\u53ef\u7528Sorry./Sorry\uff0cI can`t.\u7b49\u3002
Eg5. \u95ee\u53e5\uff1a Can you speak English?\u80af\u7b54\uff1a Certainly \ Of course.\u5426\u7b54\uff1a Sorry, I can\u2019t
\u53c2\u8003\u8d44\u6599\uff1a\u767e\u5ea6\u767e\u79d1-\u4e00\u822c\u7591\u95ee\u53e5
will\u540e\u9762\u52a0\u52a8\u8bcd\u539f\u5f62\u3002
will \u662f\u4e00\u4e2a\u82f1\u6587\u5355\u8bcd\uff0c\u6709\u591a\u79cd\u8bcd\u6027\uff0c\u53ef\u4f5c\u52a8\u8bcd\u3001\u52a9\u8bcd\u3001\u540d\u8bcd\uff0c\u5728\u4e0d\u540c\u8bcd\u6027\u4e0b\u6709\u4e0d\u540c\u89e3\u91ca\u3002\u4e00\u822c\u7528\u4e8e\u5c06\u6765\u65f6\uff0c\u8868\u793a\u201c\u5c06\u8981\u201d\u3002
will\u662f\u4e00\u4e2a\u60c5\u6001\u52a8\u8bcd\uff0c\u672c\u8eab\u6709\u4e00\u5b9a\u7684\u8bcd\u4e49\u3002\u4f46\u662f\u4e0d\u80fd\u72ec\u7acb\u4f5c\u8c13\u8bed\uff0c\u53ea\u80fd\u548c\u52a8\u8bcd\u539f\u5f62\u4e00\u8d77\u6784\u6210\u8c13\u8bed\u3002\u60c5\u6001\u52a8\u8bcd\u7528\u5728\u884c\u4e3a\u52a8\u8bcd\u524d\uff0c\u8868\u793a\u8bf4\u8bdd\u4eba\u5bf9\u8fd9\u4e00\u52a8\u4f5c\u6216\u72b6\u6001\u7684\u770b\u6cd5\u6216\u4e3b\u89c2\u8bbe\u60f3\u3002
\u6269\u5c55\u8d44\u6599\uff1a\u5176\u4ed6\u60c5\u6001\u52a8\u8bcd\u4e3e\u4f8b\uff1a
can (could), may (might), must, need, ought to, dare (dared), shall (should), will (would) must
\u56db\u5927\u5206\u7c7b
\u2460\u53ea\u505a\u60c5\u6001\u52a8\u8bcd:may, might, must..
\u2461\u53ef\u505a\u60c5\u6001\u52a8\u8bcd\u53c8\u53ef\u505a\u5b9e\u4e49\u52a8\u8bcd\uff1a\u5982\uff1aneed, dare,can
\u2462\u5177\u6709\u60c5\u6001\u52a8\u8bcd\u7279\u5f81\uff1ahave(had,has) to,used to, ought to\u3000
\u2463\u53ef\u505a\u60c5\u6001\u52a8\u8bcd\u53c8\u53ef\u4f5c\u52a9\u52a8\u8bcd\uff1a\u5982\uff1ashall(should),will(would)
\u6ce8\u610f\uff1amustn't\u4ee3\u8868\u5f3a\u70c8\u7981\u6b62 must\u8868\u793a\u4e3b\u89c2\uff0chave to\u8868\u793a\u5ba2\u89c2\u3002\u7f8e\u5f0f\u82f1\u8bed\u4e2d\u5e38\u7528must not \u800c\u4e0d\u7528 mustn't. mayn't,mightn't\u548cshan't\u4e5f\u5f88\u5c11\u7528
\u53c2\u8003\u8d44\u6599\uff1a\u60c5\u6001\u52a8\u8bcd-\u767e\u5ea6\u767e\u79d1
\u53c2\u8003\u8d44\u6599\uff1awill-\u767e\u5ea6\u767e\u79d1
意思就是说 我将做(做什么呢)我所能够做的（干什么呢）to help you 这个to help就相当于是目的状语 表示目的性
2。同理不是can to do 1L不会不要误导
what I can 和what they can在句子中作宾语，是宾语从句
断句要断在can后面，i will do what i can我将做我能做的，to help you来帮你
第二句同理
这两个句子中有省略成分，补充完整就清晰了！
(1).I will do what I can （do） to help you in return for your help.
(2).they will do what they can （do） to compete in the game.
can 是属于从句what I can 的， 而不定式 to do 是属于主句的，所以从句的情态动词管不到主句的不定式。改一下：I will do anything to help you. anything 换成what i can ，就好理解了。
（1）can和 to 不是一体的，此句的句子结构是I will do what I can & to help you in return for your help. 在& 处分开，to是不定式的标志，
(2) 跟第一个句子一样，也是在can后面断开 to后面是不定式
绛旓細can, could鍜宮ay閮芥槸鎯呮佸姩璇锛岀敤浜庤〃绀鸿姹傘佸缓璁佸彲鑳芥х瓑璇皵锛坢ood锛夌殑琛ㄨ揪锛屼絾鐢ㄦ硶鍜屽惈涔夌暐鏈変笉鍚岋細1. can 鈥Can鈥濆父甯哥敤浜庤〃绀轰竴鑸拰寮虹儓鐨勮兘鍔 (ability)锛屾彁渚涢夋嫨 (offer) 鎴栬呰姹 (request) 鏃朵娇鐢ㄣ備緥鍙ワ細- I can speak English.锛堟垜浼氳鑻辫銆傦級- Can I help you?锛堟垜鑳藉府浣犲悧...
绛旓細This can't be true.杩欎笉鍙兘鏄湡鐨勩鎯呮佸姩璇could鐨勭敤娉曪細1銆佽〃绀衡滆兘鍔涒濇垨鈥滃彲鑳芥р,浣滀负can鐨杩囧幓褰㈠紡銆備緥鍙ワ細Could you speak English then?閭ｆ椂浣犺兘璁鑻辫鍚?2銆佽〃绀烘儕寮傘佹鐤戙佷笉鐩镐俊绛夋儏缁備緥鍙ワ細Who could have taken them?璋佷細鎶婂畠浠嬁璧颁簡鍛?鍦ㄨ繖绉嶆儏鍐典笅锛宑ould鍜宑an鏄彲浠ユ崲鐢ㄧ殑...
绛旓細涓銆佷綘纭疄璇村緱寰堟湁閬撶悊锛屼竴鑸儏鍐典笅锛can锛坈ould锛夎〃鎺ㄦ祴鐨勬椂鍊欑敤浜庝笉瀹氳姘旓紝鍗冲惁瀹氥佺枒闂垨鏉′欢鍙ヤ腑锛屽锛欻e can't have been at home, for the light was not on.Can he be at home? You see the light is not on.If he can be at home, the light should be on.浜屻佷絾鏄墍璋撶殑...
绛旓細銆婁粠闆跺紑濮嬪璇硶 鎯呮佸姩璇峜an涓巑ay鐨勭敤娉曘嬬敱鑻辫鎴戞暣鐞,鏇村璇疯闂:https://www.liuxue86.com/english/銆傛湰鍐呭鏁寸悊鏃堕棿涓05鏈12鏃ワ紝濡傛湁浠讳綍闂璇疯仈绯绘垜浠傛儏鎬佸姩璇 鎯呮佸姩璇嶆湁涓瀹氱殑璇嶄箟锛屼絾璇嶄箟涓嶅畬鍏紝椤诲悓鍔ㄨ瘝鍘熷舰杩炵敤锛涙儏鎬佸姩璇嶆病鏈変汉绉板拰鏁扮殑鍙樺寲锛涚枒闂彞鐩存帴鎶婃儏鎬佸姩璇嶆彁鍓嶏紝鍚﹀畾鍙ュ湪鎯呮...
绛旓細浣滀负鎯呮佸姩璇鏃讹紝涓哄暐鈥can鈥濄佲渕ay鈥濄佲渨ill鈥濄佲渉ave鈥濈瓑閮芥湁杩囧幓寮.
绛旓細1.鎯呮佸姩璇锛堝can銆乵ay銆乵ight銆乻hould銆乵ust绛夛級鍚庨潰鎺ュ姩璇嶅師褰㈡潵琛ㄧず鑳藉姏銆佽鍙佸彲鑳芥с佷箟鍔°佸繀瑕佹х瓑銆備緥濡傦細He can swim.锛堜粬浼氭父娉炽傦級You may leave now.锛堜綘鐜板湪鍙互绂诲紑銆傦級They should study for the exam.锛堜粬浠簲璇ヤ负鑰冭瘯鑰屽涔犮傦級2.濡傛灉闇瑕佷娇鐢ㄥ悕璇嶆垨鍔ㄥ悕璇嶏紝鍙互閫氳繃閰嶅悎鍔ㄨ瘝"be"...
绛旓細4.琛ㄧず鎯婂紓銆佷笉鐩镐俊绛夛紙鐢ㄤ簬鐤戦棶鍙ャ佸惁瀹氬彞鎴栨劅鍙瑰彞涓級,鎰忔濇槸锛氫細,鍙兘.濡傦細This can't be true.杩欎笉鍙兘鏄湡鐨.Can it be true?杩欏彲鑳芥槸鐪熺殑鍚?浜屻鎯呮佸姩璇could鐨勭敤娉 1.琛ㄧず鈥滆兘鍔涒濇垨鈥滃彲鑳芥р,浣滀负can鐨杩囧幓褰㈠紡.濡傦細Could you speak English then?閭ｆ椂浣犺兘璁鑻辫鍚?He said he ...
绛旓細1銆 閭ｄ釜to 涓嶆槸璺熷湪can鍚庨潰鐨 鑰屾槸淇グwhat i can鐨~鎰忔濆氨鏄 鎴戝皢鍋(鍋氫粈涔堝憿)鎴戞墍鑳藉鍋氱殑锛骞蹭粈涔鍛級to help you 杩欎釜to help灏辩浉褰撲簬鏄洰鐨勭姸璇 琛ㄧず鐩殑鎬 2銆傚悓鐞嗕笉鏄痗an to do 1L涓嶄細涓嶈璇
绛旓細渚嬪彞锛欼 can speak English. 璇戯細鎴戜細璇鑻辫銆係he can dance. 璇戯細濂逛細璺宠垶銆傗憽琛ㄧず鍙兘鎬э紝"can"璇戜负"鍙兘锛涗細"渚嬪彞锛欳an you sing? 璇戯細浣犱細鍞辨瓕鍚?Can you swim? 璇戯細浣犱細娓告吵鍚?鈶"can"鐢ㄥ湪鑲畾鍙ヤ腑锛氫富璇紜can锛鍔ㄨ瘝鍘熷舰 渚嬪彞锛欼 can play the guitar. 璇戯細鎴戜細寮瑰悏...
绛旓細can琛ㄧず浠ヤ簨瀹炵悊鐢变负渚濇嵁鑰屽瓨鍦ㄧ殑鍙兘鎬э紝璇皵杈冨己锛屽彨鑲畾銆俶ay,might,璇皵杈冨急娌￠偅涔堣偗瀹氾紝鍏朵腑might鏇村濠夈備絾鏄痗an鍙彲鐢ㄤ簬鐤戦棶鍙ュ拰鍚﹀畾鍙ヤ腑銆備緥濡锛歝an it be lucy's ? 杩欐槸闇茶タ鐨勪箞 you can't expect to be a top student without working hard.涓嶅姫鍔涘涔犳槸涓嶅彲鑳芥垚涓哄皷瀛愮敓鐨勩 璇皵鏄...
