Unit6 Space exploration-grammar學(xué)案

編輯: 逍遙路 關(guān)鍵詞: 高二 來源: 高中學(xué)習(xí)網(wǎng)
  在復(fù)合句中,由從句表示的狀語(yǔ)叫做狀語(yǔ)從句。它可以用來修飾主語(yǔ)中的動(dòng)詞.形容詞.副詞等。根據(jù)它表達(dá)的意思,狀語(yǔ)從句可以分為時(shí)間狀語(yǔ)從句,地點(diǎn)狀語(yǔ)從句,條件狀語(yǔ)從句,比較狀語(yǔ)從句,目的狀語(yǔ)從句,結(jié)果狀語(yǔ)從句和讓步狀語(yǔ)從句等。由連接詞if或unless引導(dǎo)的狀語(yǔ)從句叫做條件狀語(yǔ)從句。(注意:在含有條件狀語(yǔ)從句的復(fù)合句中,如果主句是一般將來時(shí)態(tài),從句要用一般現(xiàn)在時(shí)[主將從現(xiàn)原則])
 經(jīng)典語(yǔ)句:If it doesn't rain tomorrow, we will go to the zoo.
     If you open the door,I will come in.
  條件狀語(yǔ)從句就是用以表示“在某種條件下,會(huì)……”。常用if ,in case , on condition等詞來引導(dǎo),連接詞主要有 if, unless, as/so long as, on condition that, provided, suppose, supposing 等。主句用一般將來時(shí),if或unless引導(dǎo)的條件狀語(yǔ)從句用一般現(xiàn)在時(shí)。
   固定搭配:unless = if...not. 
   e.g. Let's go out for a walk unless you are too tired.
    If you are not too tired, let's go out for a walk.
if 引導(dǎo)的條件句有真實(shí)條件句和非真實(shí)條件句兩種:
  真實(shí)條件句,
  如:If it rains tomorrow, we won’t go on a picnic.
  非真實(shí)條件句是虛擬語(yǔ)氣的一種,表示與事實(shí)相反,如:
    If I were you, I would go with him.
 so/as long as只要
    由as (so) long as, in case引導(dǎo)。
    So long as you’re happy, it doesn’t matter what you do.
    只要你高興,你做什么都沒有關(guān)系。
    You may borrow my book as long as you keep it clean.
    只要你保持書的清潔,你就可以把我的書借去。
    Take your umbrella in case it rains.
    帶著你的傘吧,以防下雨。
【練一練】
用括號(hào)內(nèi)所給動(dòng)詞的適當(dāng)形式填空。
1. If you (get) up early tomorrow morning, you (catch) the early bus.
2. If he (be) free this weekend, he (visit) his grandparents.
3. —I don’t know if he (come) to the party.
—Don’t worry. If he (come), I will let you know first.
4. (leave) it for me if Mary (not want) to do it.
Keys:

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