C．should be
D．would be
解析 句意：如果我的车更加可靠的话，去年夏天我就开车
去拉萨而不乘飞机啦。本题考查虚拟语气。if从句与过去事
实相反，故应用过去完成时。
答案 B
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as if 用法解析
as if 从句资的料仅供参考语气及时态
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： 1） It sounds as if it is raining． 听起来像是在下雨。
2） He talks as if he is drunk． 从他谈话的样子来看他是醉了。
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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：
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• 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：
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用 法 ①过去式if从（句be动词用were） 主 句
②should/were to +动词
原形
表示与将来事
should/would/could/mig
实相反
ht＋动词原形
例句：
If we should fail in this matter，we
(ruin).
If it rained/should rain/were to rain tomorrow, I home.
1. He lay still for a long while as if (he were) dead.
2. He left the room hurriedly, as if (he was) angry.
as if + 名词
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e.g. He acts as if (he were)
1）You look as if you didn’t care． 你看上去好像并不在乎。
2） He talks as if he
(know) where
she was．
他说话的样子，好像他知道她在哪里似的。
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（2）从句表示与过去事实相反， 谓语动词用“had＋过去分词”。 如：
1) He talks about Rome as if he (be) there before．
(stay)at
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• 如果从句中有should，were或had的时候，可以 省略if，把should，were或had提到主语之前， 构成倒装。
• If I were you, I would go with them. = Were I you,
If it should rain tomorrow, I would stay at home.
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If you go to the Science Museum ， you (see) a lot of interesting exhibitions.
If people don't stop polluting the air，animals
and plants
soon (die).
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2．非真实条件句(虚拟条件句)
有些条件句表示不大可能实现的或与事实相反的情况， 被称为非真实条件句.
用法
if从句
表示与过去事实相反
had＋过 去分词
主句
should/would/could/ might＋动词原形
If they had invited her，she
(attend) it.
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as if + 现在分词（doing）
1) From time to time Jack turned round as if (he was) searching for someone 2) He paused as if expecting Mary to speak.
他张开嘴好像要说什么。
2) It looks as if it 看来好像要下雪了。
(snow)．
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as if 的省略情况
• 当as if/ though 从句中的主语 与主句中的主语一致时，可以省略 as if 从句中的主语（和be动词）， 情况如下：
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as if + 形容词
用法
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if从句
主句表Leabharlann 与现在事 实相反过去式（be 动词用were）
should/would/could/mi ght＋动词原形
例句： If I were you，I
(invite) him to the party.
If she were younger，she science.
(study) computer
= Should it rain tomorrow,
语法专练
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1．If my car________more reliable，I would have driven to
Lhasa instead of flying last summer.
(2012·陕西)
A．was
B．had been
他说起罗马来好像他以前去过罗马似的。
2）You look as if you a ghost.
(see)
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（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：
1)He opened his mouth as if he (say) something．
a fool.
as if +介词短语
e.g. He looked about as if (he was) in search of something.
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as if + to do 1) He raised his hand as if (he was going) to say something. 2) He opened his lips as if (he were) to make some reply.