if主現從現的用法—if主現從現和主將從現的區別

新概念二L16語法：if 引導的條件狀語從句

If引導的條件狀語從句中，從句動詞必須使用一般現在時來表示將來，而主句使用一般將來時。

注意：1. ‘主將從現’是歷年中考的重點考點。

2.主句的一般將來時可以用can +動詞原形來代替。

3. 主句的一般將來時的陳述句也可以用祈使句來代替。

4. 主句和從句都可以放在句首。

例句：

1. If you park your car in the wrong place, a traffic policeman will soon find it.

2. You will be very lucky if he lets you go without a ticket.

3. You will enjoy your stay here if you pay attention to our street signs.

4. If you receive a request like this, you cannot fail to obey it!

5. If you see him, will you tell him about it?

6. She will come to the party if she is free.

7. You will miss the train if you don't hurry.

8. Please don't disturb him if he is too busy.

用括號中所給動詞的適當形式填空

1. If it ___________(rain) tomorrow, we'll put off the soccer match.

2. If the boy plays basketball well, he _________(get) into the school team.

3. You ________never_________(pass) the driving test if you don't practise hard.

4. I _______________(pick) you up at the airport if I have time then.

5. Ask me for help if you ________(have) any problem.

6. Please tell Tom to phone me if he __________(decide) to join us.

7. If they ____________(work) hard, they will surely be successful in the end.

8. If you don't slow down now, you ______________(have) a traffic accident.

9. You can have a good rest if you _________(feel) tired.

10. If you are friendly to others, they _______________(be) friends with you.