动词不定式to为什么Can i have my bike back please?中back 前为什么不加to会不会是书本有错啊

动词不定式to为什么Can i have my bike back please?中back 前为什么不加to会不会是书本有错啊 I can help you to solve this problem.为什么要加动词不定式? 1.there isn't much I can do to help him这句话里怎么有4个动词（系动词 情态动词 实义动词 不定式）为什么不是I can help him,加do干嘛?2.he hasn't got as much work to do as I have.这句话里为什么有to do? I can't choose which book to buy.为什么用to buy?是动词不定式作定语修饰book吗? 关于这个英语句子中的问题I can speak a little English.此处的谓语为复合谓语 can+speak（情态动词+动词不定式）但是这里的动词不定式为什么没有to? I believe the child to have told the truth 怎么理解I believe the child to have told the truth 为什么用动词不定式 I have much housework to do.及使役动词let have make 后常跟不带to的不定式作宾补.但为什么这题加to? 动词不定式包括to 例如：The only person I have ever known to have a skeleton in the cupboard..这句话know后的to是独自做宾语+动词不定式.还是动词不定式是to have a skeleyon. 动词不定式包括to 例如：The only person I have ever known to have a skeleton in the cupboard..这句话know后的to是独自做宾语+动词不定式?还是动词不定式是to have a skeleyon? I DON'T HAVE MUCH TO DO.这个TO在这里是什么意思?是动词不定式吗? 我知道want sb to do sth中,动词不定式是做宾补,我想问一下,我要把TO后面的理解为动词不定式表目的对吗,为什么,比如I want you to have lunch,to have lunch理解成动词不定式表目的， what can you do to stop sandstorm?为什么用to stop动词不定式 英语动词不定式既然已经不带TO为什么还要叫做不带TO的动词不定式?eg;有一说是说,在情态动词和助动词后的不定式不带toI can do it myself.难道没有情态动词的时候就该是I to do it myself.问题是这 一个关于初一动词不定式的问题I have an interesting thing__(tell) you.里面为什么要填不定式? I don't have enough time to spend with her.中的动词不定式做什么成分 疑问词+动词不定式 I can't decide ______________________A what to eatB.how to eatC.where to eatD.when to eat 比如I want you to have lunch,to have lunch理解成动词不定式表目的,对吗, 为什么“to+动词原形”叫“不定式”?