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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