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May 28, 2015

Homework Help: English

Posted by rfvv on Tuesday, July 16, 2013 at 12:51am.

1. He can not solve the math problem.
2. He cannot solve the math problem.
3. He can't solve the math problem.
4. He could not solve the math problem.
5. He couldnot solve the math problem.
6. He couldn't solve the math problem.

(Are they all grammatical? What about #5? Is it wrong expression?)

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