第1个回答 2007-11-18
1.不定式的被动态是由to be + -ed 分词或to have been+ -ed分词构成。
2.不定式通常带to ,但在某些搭配中不带to ,在另一些搭配中既可带to 也可以不带to 。例如:在would rather/would sooner/would(just)as soon,may/might(just) as well,cannot but/cannot help but等情态动词之后不带to .would rather/would sooner/would(just)as soon 之后也能跟than/as 分句,在这种分句中也不带to.例如:I would just as soon stay as go.
3.如果except/but之前有动词"do"的某种形式,其后通常用不带to不定式(就是不带to的意思),否则带to。
4.在Why.../Why not...?句式中,也不带to。
5.当两个带to不定式由and或or连接是,第二个不定式符号常可省略。例如I intend to call on him and discuss this question again.但若两个并列的带 to不定式有对比含义,第二个不定式符号便不能省略 :To be or not to be,that is the question. 当三个或三个以上带 to不定式构成排比结构时,所有的不定式符号均须保留:Read not to contradict or confute;nor to believe and take for granted;nor to find talk and discourse;but to weigh and consider.(Bacon)