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as if 的用法

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2024年4月6日发(作者:暨听春)

as if 的用法

as if 好像,好似 She spoke to me as if she knew me. 她和我说话的神情,好像她早就认识我似的。 (= as

though)

as if 的用法

一、as if 从句的作用 1. 在look, seem 等系动词后引导表语从句。如: She looks as if she were ten years

younger. 她看起来好像年轻了十岁。 It seems as if our team is going to win. 看来我们队要胜了。 2. 引

导方式状语从句。如: She loves the boy as if she were his mother. 她爱这男孩,就好像她是他的母亲

一样。 The child talked to us as if he were a grownup. 那孩子跟我们谈起话来,像个成年人似的。 二、

as if 还可用于省略句中 如果as if 引导的从句是“主语+系动词”结构,可省略主语和系动词,这样as if 后

就只剩下名词、不定式、形容词(短语)、介词短语或分词。如: He acts as if (he was) a fool. 他

做事像个傻子。 Tom raised his hands as if (he was going) to say something. 汤姆举起手好像要说

什么。 She left the room hurriedly as if (she was)angry. 她匆忙离开房间好像生气的样子。 三、as if

从句的语气及时态 1. as if 从句用陈述语气的情况。 当说话者认为句子所述的是真实的或极有可能发生

或存在的事实时。如: It sounds as if it is raining. 听起来像是在下雨。 He talks as if he is drunk. 从

他谈话的样子来看他是醉了。 2. as if 从句用虚拟语气的情况。 当说话人认为句子所述的是不真实的或

极少有可能发生或存在的情况时。从句虚拟语气动词时态的形式如下: (1)如果从句表示与现在事实相

反,谓语动词用一般过去时。如: You look as if you didn’ t care. 你看上去好像并不在乎。 He talks as

if he knew where she was. 他说话的样子,好像他知道她在哪里似的。 (2)从句表示与过去事实相反,

谓语动词用“had+过去分词”。如: He talks about Rome as if he had been there before. 他说起罗马来

好像他以前去过罗马似的。 The girl listened as if she had been turned to stone. 那女孩倾听着,一动也

不动,像已经变成了石头似的。 (3)从句表示与将来事实相反,谓语动词用“would/could/might+动

词原形”。如: He opened his mouth as if he would say something. 他张开嘴好像要说什么。 It looks as

if it might snow. 看来好像要下雪了。

whether和if的用法分析

一、相同之处。

r和if都能引导宾语从句,常置于see,ask,learn,tell,wonder,doubt,find out等动词之后。

如:He asked me whether/is I could help him. I want to know whether/if he lives there.

r和if都可用it作形式主语从句中。如: it's uncertain whether/if he'll come this evening.

3.在be uncertain/doubtful之后,常用whether引导宾语从句,有时也可以用if,如: We are uncertain

whether/if Mary will come.

二、不同之处。

r可置于句首引导主语从句,而if不能。如: ___the 2000 Olympic Games will be in Beijing is not

known yet. r r 答案是C。

r可用在介词之后,引导宾语从句,而If则不能。如: Success depends on whether we make

evough effort.

r可引导表语从句,if则不能。如: The puestion is whether it is not worth doing.

4.在名词之后引导同位语从句时,用whether而不用if。如: The question whether the students answered

correctly should be decided by the teacher.

r后可接不定式,而if不能。如: Please tell us whether to go or stay here.

6.在有些动词(如discuss)之后,只能用whether,而不用if引导宾语从句。如: We discussed whether

we should close the shop.

7.在引导否定概念in宾语从句时,只能用if,而不用whether.如:he asked me if I hadn't finished my work.

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

whether和if都可以引导宾语从句,表示“是否”,在口语或间接引语中两者可以互换使用。如:

I wonder if / whether I can get some advice from you.

Ask him whether / if he can come.

但在有些情况下,whether和if的用法有一定区别。

1. whether引导的从句常可以与连词or或or not直接连用,而if一般不能。如:

正: Let me know whether you can come or not.

误: Let me know if you can come or not.

2. 当宾语从句提到句首时,只能用whether引导,而不能用if。如:

正: Whether it is true or not, I can’t tell.

误: If it is true or not, I can’t tell.

3. whether可以引导带to的不定式,if则不能。如:

正: I don’t know whether to accept or refuse.

误: I don’t know if to accept or refuse.

4. whether及其引导的成分可放于介词之后,作介词的宾语,但if不能。如:

正: I worry about whether I hurt her feelings.

误: I worry about if I hurt her feelings.

5. whether可以引导从句,作主语、表语或同位语,而if不能。如:

正: It was uncertain whether he would come.

误: It was uncertain if he would come.

正: His first question was whether Tom had arrived yet.

误: His first question was if Tom had arrived yet.

正: We must consider the question whether we will take these measures.

误: We must consider the question if we will take these measures.

2024年4月6日发(作者:暨听春)

as if 的用法

as if 好像,好似 She spoke to me as if she knew me. 她和我说话的神情,好像她早就认识我似的。 (= as

though)

as if 的用法

一、as if 从句的作用 1. 在look, seem 等系动词后引导表语从句。如: She looks as if she were ten years

younger. 她看起来好像年轻了十岁。 It seems as if our team is going to win. 看来我们队要胜了。 2. 引

导方式状语从句。如: She loves the boy as if she were his mother. 她爱这男孩,就好像她是他的母亲

一样。 The child talked to us as if he were a grownup. 那孩子跟我们谈起话来,像个成年人似的。 二、

as if 还可用于省略句中 如果as if 引导的从句是“主语+系动词”结构,可省略主语和系动词,这样as if 后

就只剩下名词、不定式、形容词(短语)、介词短语或分词。如: He acts as if (he was) a fool. 他

做事像个傻子。 Tom raised his hands as if (he was going) to say something. 汤姆举起手好像要说

什么。 She left the room hurriedly as if (she was)angry. 她匆忙离开房间好像生气的样子。 三、as if

从句的语气及时态 1. as if 从句用陈述语气的情况。 当说话者认为句子所述的是真实的或极有可能发生

或存在的事实时。如: It sounds as if it is raining. 听起来像是在下雨。 He talks as if he is drunk. 从

他谈话的样子来看他是醉了。 2. as if 从句用虚拟语气的情况。 当说话人认为句子所述的是不真实的或

极少有可能发生或存在的情况时。从句虚拟语气动词时态的形式如下: (1)如果从句表示与现在事实相

反,谓语动词用一般过去时。如: You look as if you didn’ t care. 你看上去好像并不在乎。 He talks as

if he knew where she was. 他说话的样子,好像他知道她在哪里似的。 (2)从句表示与过去事实相反,

谓语动词用“had+过去分词”。如: He talks about Rome as if he had been there before. 他说起罗马来

好像他以前去过罗马似的。 The girl listened as if she had been turned to stone. 那女孩倾听着,一动也

不动,像已经变成了石头似的。 (3)从句表示与将来事实相反,谓语动词用“would/could/might+动

词原形”。如: He opened his mouth as if he would say something. 他张开嘴好像要说什么。 It looks as

if it might snow. 看来好像要下雪了。

whether和if的用法分析

一、相同之处。

r和if都能引导宾语从句,常置于see,ask,learn,tell,wonder,doubt,find out等动词之后。

如:He asked me whether/is I could help him. I want to know whether/if he lives there.

r和if都可用it作形式主语从句中。如: it's uncertain whether/if he'll come this evening.

3.在be uncertain/doubtful之后,常用whether引导宾语从句,有时也可以用if,如: We are uncertain

whether/if Mary will come.

二、不同之处。

r可置于句首引导主语从句,而if不能。如: ___the 2000 Olympic Games will be in Beijing is not

known yet. r r 答案是C。

r可用在介词之后,引导宾语从句,而If则不能。如: Success depends on whether we make

evough effort.

r可引导表语从句,if则不能。如: The puestion is whether it is not worth doing.

4.在名词之后引导同位语从句时,用whether而不用if。如: The question whether the students answered

correctly should be decided by the teacher.

r后可接不定式,而if不能。如: Please tell us whether to go or stay here.

6.在有些动词(如discuss)之后,只能用whether,而不用if引导宾语从句。如: We discussed whether

we should close the shop.

7.在引导否定概念in宾语从句时,只能用if,而不用whether.如:he asked me if I hadn't finished my work.

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

whether和if都可以引导宾语从句,表示“是否”,在口语或间接引语中两者可以互换使用。如:

I wonder if / whether I can get some advice from you.

Ask him whether / if he can come.

但在有些情况下,whether和if的用法有一定区别。

1. whether引导的从句常可以与连词or或or not直接连用,而if一般不能。如:

正: Let me know whether you can come or not.

误: Let me know if you can come or not.

2. 当宾语从句提到句首时,只能用whether引导,而不能用if。如:

正: Whether it is true or not, I can’t tell.

误: If it is true or not, I can’t tell.

3. whether可以引导带to的不定式,if则不能。如:

正: I don’t know whether to accept or refuse.

误: I don’t know if to accept or refuse.

4. whether及其引导的成分可放于介词之后,作介词的宾语,但if不能。如:

正: I worry about whether I hurt her feelings.

误: I worry about if I hurt her feelings.

5. whether可以引导从句,作主语、表语或同位语,而if不能。如:

正: It was uncertain whether he would come.

误: It was uncertain if he would come.

正: His first question was whether Tom had arrived yet.

误: His first question was if Tom had arrived yet.

正: We must consider the question whether we will take these measures.

误: We must consider the question if we will take these measures.

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