含有if引導(dǎo)的條件狀語(yǔ)從句的復(fù)合句表示假如有從句動(dòng)作的發(fā)生，就會(huì)有主句動(dòng)作的發(fā)生。

◆通常情況下，如果主句用一般將來(lái)時(shí)，if引導(dǎo)的條件狀語(yǔ)從句用一般現(xiàn)在時(shí)。如：

If it doesn't rain, we'll have a trip.

◆如果主句是祈使句或者主句的謂語(yǔ)部分含有情態(tài)動(dòng)詞，if引導(dǎo)的條件狀語(yǔ)從句也常用一般現(xiàn)在時(shí)。如：

Please call me if you come back.

You can ask the policeman for help if you're lost.

◆if引導(dǎo)的條件狀語(yǔ)從句既可放在主句之前，也可放在主句之后。從句位于主句之前時(shí)，常用逗號(hào)將其與主句隔開(kāi)。如：

We'll visit the museum if it's a fine day tomorrow.

If you go to the party, you'll meet Mr. Huang.

if引導(dǎo)的條件狀語(yǔ)從句(1)

Ⅰ. 將下面的簡(jiǎn)單句合并為“if從句+祈使句”的結(jié)構(gòu)。

1. You want to watch the weather report. Turn on the TV.

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2. You go to New York. Please call me first.

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3. The traffic light is red. Don't cross the road.

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4. You are tired. Have a rest.

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5. You don't know how to learn English well. Ask Mrs Li for help.

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Ⅱ. 翻譯句子

1. 如果你喜歡大海，就去三亞吧。

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2. 如果你有空，請(qǐng)和我打網(wǎng)球吧。

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3. 如果你去一座陌生的城市，帶上一張地圖吧。

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4. 如果你們想贏得比賽，就刻苦訓(xùn)練吧。

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5. 如果你想保持健康，就不要吃太多肉。

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表示“禁止做某事”的結(jié)構(gòu)

Ⅰ. 單項(xiàng)選擇

1. David, _______ make trouble at school.

A. can't B. don't C. doesn't

2. What does the sign mean?

A. No food. B. No entry.

C. No parking. D. No smoking.

Ⅱ. 完成句子

1. 禁止游泳。

No ________.

2. 禁止垂釣。

No ________.

3. 請(qǐng)勿拍照。

No ________.

4. 禁止寵物入內(nèi)。

No ________.

5. 晚上不要單獨(dú)外出。

________ ________ out alone at night.

6. 在圖書(shū)館里不要大聲說(shuō)話(huà)。

________ ________ loudly in a library.

if引導(dǎo)的條件狀語(yǔ)從句(2)

Ⅰ. 單項(xiàng)選擇

1. Johnson won't answer the phone if he _______ the number.

A. knew B. doesn't know

C. will know D. didn't know

2. If it _______ sunny tomorrow, I will go shopping with my friend in the supermarket.

A. will be B. be

C. is D. was

3. If you _______ able to come, I will show you around my hometown.

A. is B. can be

C. will be D. are

4. —What _______ if they _______ to the meeting late?

—Sorry, I don't know.

A. will happen; go B. happened; go

C. happens; will go D. will happen; will go

5. You can find a cinema if you ________ along this road.

A. walk B. walked

C. will walk D. have walked

Ⅱ. 翻譯句子

1. 如果你更加努力學(xué)習(xí)英語(yǔ)的話(huà)，你會(huì)取得更大的進(jìn)步。

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2. 如果你對(duì)動(dòng)物感興趣，你可能喜歡這部電影。

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3. 如果你想看電視，你必須先完成作業(yè)。

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