内容正文:
Unit 1
Food matters
动词不定式具有名词特征,可充当主语。(做主语时谓语动词用单数形式)
To see is to believe.
眼见为实。
注:单个不定式作主语时,谓语动词用单数形式;两个及以上不定式作主语时,谓语动词用复数形式;但作为一个整体时,谓语动词用单数形式。
到哪里去度假以及何时去度假还没有决定。
Where to go on a holiday and when to go for the holiday
(decide).
到哪里去,何时去度假还没有决定。
Where and when to go on a holiday__________________(decide).
To say is one thing and to do is another.
说是一回事,做又是另一回事。
have not been decided
has not been decided
动词不定式作主语
Revision
2
动词不定式句子的主语时可以用形式主语it代替,将不定式置于句末,
平衡句子结构。
It is a shame to litter.
乱扔垃圾可耻
It is a privilege to meet you.
认识你很荣幸
it 作为形式主语时,常见句型。
It + be +adj. + (for sb) to do sth ( adj 修饰物)
It + be +adj. + (of sb) to do sth ( adj 修饰人)
It + be + n. + to do sth
It takes/ took/ will take sb some time/money to do sth
动词不定式作主语
Revision
3
动词不定式句子的主语时, 若其后面需要用动词作表语时,则作表语的动词也最好使用不定式形式,保持形式一致 (to do is to do)
To save me is to save yourself.
救我也是救你自己。
动词不定式句子的主语时, 会有时态、语态