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as if 是连词,引导方式状语从句或表语从句,意思是“好像----似的”,“仿佛---似的”。其用法如下:
1引导含有虚拟语气的从句,表示情况不是真的,而是主观的想象. 如果表示和现在事实相反, 从句谓语用过去时。 例如:
He talks as if he knew all about it.
Mr Wang speaks English as if he were an Englishman.
表示和过去事实相反, 从句谓语用过去完成时。例如
He looks as if he had seen a ghost.
2 as if 引导的从句也可以表示真实的情况,如:
She walks as if there is something wrong with her foot.
It looks as if it is going to rain.
It seems as if the boy has lost his way.
3 as if 后面可以直接接不定式或分词,这实际上是从句的省略形式。
如果从句的动作在主句的动作之后,是主句谓语的目的状语,as if 后面就接不定式,例如:
He opened his lips as if to say something
She is hurrying to the station as if to meet someone.
4如果从句的动作和主句的动作同时发生,as if 后面就接现在分词,例如:
Bob is anxiously looking around as if expecting someone.
The man cried with all his strength as if hoping to be heard by everyone.
5如果从句的动作先于主句的动作且表示被动,as if 后面就接过去分词,例如:
The letter is messy and confusing as if written in a great hurry.
The boy was black and blue all over as if beaten up.
6 as if 后面除了接非谓语动词,还可以接名词或形容词,例如。
He acts as if a fool.
She hurriedly left the room as if angry.
练习:
1He feels as if he ____ on a cloud.
A is floating B floated C had floated D were floating
2The story is so descriptive—I ____ feel as if I there.
A would be B were C am D have been
3 Though the girl had been suffering from the blood disease, she acted as if nothing _____ to her while facing her friends and relatives.
A happened B would happen C was happened D had happened
4He was _____ in hospital for six months .he felt as if he was from the outside world.
A cut out B cut off C cut up D cut through
5 She dressed herself up in her best clothes as if ____ a party.
A left for B to leave for C leaving for D leave for
6 My wife seemed as if ____ the secret.
A to know B to have known C have known D know
7 The professor paused as if ____ his students to ask questions on his idea.
A expecting B to expect
C expected D to have expected
答案 1-5 DBDBB 6-7 BA