I didn’t know what to do. (宾语)
When to hold the meeting is not known yet. (主语)
My question was how to get so many books. (表语)
注意句型:Why not do sth. ? Why do sth. ?
二、不定式的主动和被动
1.不定式修饰的名词或代词和不定式逻辑上构成主谓关系时,不定式往往用主动形式。如:
Do you have a knife to cut the watermelon ?
(A knife cuts the watermelon.)
2.不定式和它前面被修饰的名词或代词构成逻辑上的动宾关系,又和该句主语构成逻辑上的主谓关系时,不定式常用主动形式。如:
She has a sister to look after. (She looks after her sister.)
I know what to do. (I do what.)
3.不定式作表语形容词的语,和句中主语构成逻辑上的动宾关系时,不定式多用主动形式,这是因为人们往往认为形容词后省去了for sb. 。如:
This book is difficult to understand.
This kind of fish is nice to eat.
4.在there be 结构中,当说话人考虑的是必须有人去完成某件事时,不定式用主动形式;如果说话人强调的事情本身必须被完成,则用被动形式。如:
There is a lot of work to do. (Someone has to do the work. )
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