I ________ chickens ________ swim.

1. A.
   think don't
2. B.
   think can't
3. C.
   don't think can
4. D.
   don't think don't

改错：

I think chickens can’t swim.

I don't think chickens can swim, ________?

1. A.
   do they
2. B.
   don't they
3. C.
   can they
4. D.
   can't they

I don’t think chickens can swim,         ?

A. do I                              B. can I                 C. do they              D. can they 

I don't think chickens can swim, ________?

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