English

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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asked by rfvv
  1. #5 is definetly wrong Also Im not sure about number 2.

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    posted by Sumare
  2. All are correct except #5.

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