Ⅰ动词不定式:
动词不定式的时态和语态
1)构成:
主动态:一般式to do完成式to have done进行式to be doing完成进行式to have been doing
被动态:一般式to be done完成式 to have been done
否定式:not+不定式
2)不定式的时态:
①不定式的一般式表示的动作与主句谓语动词表示的动作同时发生或之后发生。
He seems to know her address.
I hope to see you again.
②不定式的进行体表示的动作正在进行,与主句谓语动词表示的动作同时发生。其用法主要有以下几种情况:
a 常用在appear,happen,pretend,seem,hope,promise之后。
She pretended to be listening attentively.
Tom appeared to be living in this area.
I hope to be earning my living in a years time.
I promised to be waiting at the door when he came out.
b 常用在believe,consider,suppose,think,know,report,say,understand等动词的被动式之后。
He is thought/known/believed/said/supposed to be living in this area = People think/know/ believe/ say/suppose that she is living abroad.[据认为她住在国外。]
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