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根據(jù)句意，用括號(hào)內(nèi)所給動(dòng)詞的適當(dāng)形式填空。

  1. I         (be) busy this morning, but now I’m free.

  2. I’ll tell her the good news as soon as she         (come) back.

  3. Mary         (have) to do her homework on school nights.

 4. When Tim was at primary school, he always         (ask) some strange questions.

 5. To our excitement, there         (be) a fashion show in the sports center tomorrow.

  6. Listen! Someone         (sing) in the next room.

  7. While I         (wash) my clothes, the telephone rang.

 8. The summer vacation will begin next week.David         (come) to stay with us.

  9. Bob         (be) to Mount Huang many times, so he knows it very well.

10. When we arrived at the station, the train          (leave), so we didn’t catch the train.

Key:

【經(jīng)典習(xí)題】

     1. was               

     2.comes        

     3.has                

     4.asked   

     5.will be / is going to be 

     6. is singing       

     7. was washing      

     8.is coming       

     9. has been           

    10.had left

★ 一般現(xiàn)在時(shí)：

→ 表示存在的狀態(tài)或經(jīng)常性、習(xí)慣性的動(dòng)作，常與often, usually, always, sometimes等連用；

→ 表示客觀真理、科學(xué)事實(shí)、格言以及不受時(shí)間限制的客觀存在；

→ 由if, unless, as soon as, when等引導(dǎo)的條件和時(shí)間狀語從句中，常用一般現(xiàn)在時(shí)表示將來。如：I will not go boating if it rains tomorrow.

★ 一般過去時(shí)：

表示過去某個(gè)時(shí)間發(fā)生的動(dòng)作或存在的狀態(tài)及過去習(xí)慣性、經(jīng)常性的行為，常與yesterday, just now, last week, in 2008, two days ago等連用。

★ 現(xiàn)在進(jìn)行時(shí)：am/is/are + 動(dòng)詞-ing形式

→ 表示此刻或現(xiàn)階段正在進(jìn)行的動(dòng)作，常與now, at the moment等連用；

→ 以Look!或Listen!開頭的句子中常用現(xiàn)在進(jìn)行時(shí)；

→ 現(xiàn)在進(jìn)行時(shí)還可表示即將發(fā)生的事情，相當(dāng)于一般將來時(shí)，這類詞有arrive, come, go, leave, return, start等。

★ 過去進(jìn)行時(shí)：was/were + 動(dòng)詞-ing形式

表示過去某一段時(shí)間或某一時(shí)刻正在進(jìn)行的動(dòng)作，常與at that time / moment, at this time yesterday等連用。

★ 一般將來時(shí)：will/shall + 動(dòng)詞原形；am/is/are going to + 動(dòng)詞原形

→ 表示將來某一時(shí)刻即將發(fā)生的動(dòng)作或存在的狀態(tài)，常與tomorrow, next month等連用。

★ 現(xiàn)在完成時(shí)：have/has + 過去分詞

表示過去發(fā)生的動(dòng)作對(duì)現(xiàn)在造成影響或結(jié)果，或表示過去的動(dòng)作或狀態(tài)一直持續(xù)到現(xiàn)在，常與already, yet等連用。

★ 過去完成時(shí)：had + 過去分詞

表示在過去某一時(shí)間或動(dòng)作之前已經(jīng)發(fā)生或完成的動(dòng)作。常與before, by, by the end of, by the time等引導(dǎo)的時(shí)間狀語（從句）連用。