4. She has known Sam . (for,never,since) nine years.

3. 一Have you cleaned your room (for,just,yet) ? —Yes,I have.

2. —How long has Mr Wang worked in our factory?

—He has worked here (already,just,since) he left school.

1. —Is Simon washing the dishes now?

—No,he has (already,ever,for) washed them.

9. Have you done your homework (for,just,yet) ?

知識點二動詞的過去分詞大多數(shù)動詞的過去分詞變化形式同動詞的過去式，可參照動詞的過去式變化規(guī)則。

不規(guī)則動詞的過去分詞變化。右此劫詞的討豐分詞釦過去太的變化形式相同，其變化情況如下：

有些動詞的過去分詞和過去式的變化形式不同，其變化情況如下：

( )3(單項選擇）I won’t go to the concert because I my ticket.

A. lost B. don’t lose c. have lost D. have lose

知識點一現(xiàn)在完成時

 (1) 表示過去發(fā)生或已經(jīng)完成的某一動作對現(xiàn)在造成的影響或結果。常與just,yet,ever,never,already,before 連用。

() 1.(單項選擇) 一Have you seen the bag,madam? —No,I have seen it.

   A. ever;never   B. already;before C. just;ever   D. yet;already 

(2) 表示動作或狀態(tài)開始于過去，一直延續(xù)到現(xiàn)在，甚至還可能繼續(xù)延續(xù)下去。常與for,since,so far,in the past/last+—段時間，recently 等連用。

2.  (翻譯) 李先生從出生以來就住在這里。

Mr Li here he was born.

基礎詞匯過關(寫出下列動詞的過去式和過去分詞)

1. be 2. find

3. begin 4. forget

5. bring 6. leave

7. draw 8. work

() 5.    ，do you know where the nearest post office is?

   A. By the way   B. On the way

    C. In the way   D. To the way