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Conditional sentences have two parts: the if-clause and the main clause.

條件語句有兩部分： if從句和主句。

比如:

If it rains, I will cancel the trip.

If it rains是從句，I will cancel the trip 是主句。

The IF-clause introduces a condition. The main clause is the result of that condition.

IF從句引入了一個條件。主句是條件的結果。

What happens in the main clause is conditional to what happens in the if-clause. In other words the main clause only happens when the events in the if-clause happen.

在主句裡的事件是在從句裡所發生事件的條件下發生的。也就是說，主句的情況只能在從句的事件發生後引發。

There are 4 main types of conditional clauses (if-clauses)...

這裡有四種類型的條件從句

As you can see, each type of conditional has its own combination of tense used in the if-clause and tense used the main clause. These different pairings of tenses give each type of conditional its own meaning.

如你所見，每種類型的條件有它自己的從句與主句時態。這些一對對的時態給予了這些條件語句獨特的意思。

Other types of conditional clauses 其他類型的條件語句

Now, these four types of conditional clauses are the traditional ones though there are OTHER types of conditional clauses.

這四種條件語句是傳統語句，雖然還有一些其他類型的條件語句。

IF + PRESENT SIMPLE一般現在時, ...+ IMPERATIVE祈使語態

We use the imperative to give instructions of advice.

我們使用祈使語態來給出建議。

• If you see John, tell him he needs to come to my office.

• If you travel abroad, remember your passport

• If you go to Australia, send me a postcard.

• If you go to the supermarket, bring

  back some milk.

• If Mike comes, call me.

• If you drink, don't drive.

The highlighted words are in the imperative. These sentences are similar to saying: If the first condition happens, you must do this (in the second/imperative clause).

粗體的是祈使語態。這些句子都非常類似：If每一個條件發生，你必須做這個。

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