就这样讲英语。。。。。(13)

条件句子（Conditional Clause）在英语的应用中是应学习的；为何是条件句子呢？那是因为句子的如果(IF)形成了条件（Conditional）. 那就是我们有了一个“假定”，“如果”的情况，来猜想某某事件的后果。

If - Conditional Clause 有三个不同文法的构造。（1）现在式 (PRESENT TENSE)（2）过去式(PAST TENSE)（3）过去完成式 (PAST PERFECT TENSE)

在理论上，在（1）现在式 (PRESENT TENSE) 和（2）过去式(PAST TENSE)的“假定”情况下，某某事件的发生或实现的可能性很高！ 在（3）过去完成式 (PAST PERFECT TENSE)中，某某事件的发生是不可能发生，它只是用来本达遗憾。

文法的处理：

1） 现在式 (PRESENT TENSE)

主句(MAIN CLAUSE)是 未来式(FUTURE TENSE) 假定句( CONDITIONAL CLAUSE)是现在式 (PRESENT TENSE)

如： I shall/will buy this car, If I have enough money

He will go to see you if he has time.

If it rains, Peter will not come here.

2） 过去式(PAST TENSE)

主句 (MAIN CLAUSE) 是 未来过去式(FUTURE PAST TENSE) 假定句(CONDITIONAL CLAUSE) 是过去式(PAST TENSE)

如： I would buy this car, if I had enough money.

He would go to see you if he had time.

If it rained, Peter would not come here.

3） 过去完成式 (PAST PERFECT TENSE)

主句 (MAIN CLAUSE) 是 未来完成式 （would + have + past participle）,假定句(CONDITIONAL CLAUSE)是过去完成式 (PAST PERFECT TENSE)

如：I would have bought this car, if I had had enough money （我不可能买了- 很遗憾）

He would have gone to see you if he had had time. （他不可能去见她了- 很遗憾）

Shirley would have passed the exam, if she had worked extra hard. （很遗憾没用功结果考试 没及格）