Given a sentence, determine if it contains incorrect grammar. If so, explain what is incorrect.
She didn't went to the store.
This sentence contains incorrect grammar because 'went' should be replaced with 'go'.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Given a sentence, determine if it contains incorrect grammar. If so, explain what is incorrect.

### Response:
This sentence contains incorrect grammar because 'went' should be replaced with 'go'.