Jay was singing a song just now.
A song was being sung by Jay just now.
现在完成时
Jay has sung lots of songs in the past
few years.
Lots of songs have been sung by Jay in
the past few years.
过去完成时
Jay had sung plenty of songs by last year.
Plenty of songs had been sung by Jay by last year.
过去将来时
Jay said he would sing more songs in the future.
Jay said more songs would be sung in the future.
情态动词的被动语态为:情态动词+助动词be+及物动词的过去分词。
4.动词的不定式
动词不定式是不受主语、人称以及时态、语态影响的形式。其基本形式为:to+动词原形。它在句中可以充当除谓语以外的一切成分。
1)不定式作主语
不定式可在句中作主语。在绝大部分情况下用it作形式主语,不定式放在后面。It is...to do sth.../it takes...sb...+to do sth./it is+形容词+for sb. to do sth,/it is十形容词+ of sb. to do sth.
2)不定式作宾语
有些动词后面只能跟不定式作宾语。初中阶段常见的有agree,apply,afford,choose,dare,decide,determine,expect,manage,offer,pretend,prepare,refuse,want。如:decide to do,manage to do,pretend to do。
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