英語助動詞的萬能原則——一次句話弄清所有情況下助動詞的用法

變疑問句的時候，有的老師開始講如何把助動詞提前。。。

變否定句的時候，有的老師又開始講如何在助動詞後＋not。。。

變反意疑問句的時候，有的老師又開始講如何用助動詞。。。

甚至在講初中八大時態的疑問句時要講八次助動詞，其實所有情況下助動詞的用法一句話就解決了：句子結構中有現成的助動詞的，用這個助動詞，句子結構中沒有現成的助動詞時用萬能助動詞(do/does/did)。

根據以上法則完成下列習題：

1. --What ____ you doing there?

   --I'm cleaning the car.

2. --___ you do your homework every day?

   --Yes, I do my homework in the evening.

3. They can come here before 6, ____ they?(反意疑問句)

4. He practised speaking with a foreigner, ____ he?(反意疑問句)

5. The doctor has finished the operation, ____ he?(反意疑問句)

6. --The engineer comes from China.

   --So he_____, he's from Hangzhou.

7. --The engineer is from China.

   --So he_____, he's from Hangzhou.

8. --Lucy is very beautiful.

   --So___Lily, they are twins.

9. --Jim dances very well

   --So___Tom, they often dances together at the party.

--I am going shopping.

--So ___ I. Let's go together.

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