Example: The cat chase the rat.
Method: Figure out if the subject is singular or plural. Then, find the verb. If the subject is singular then the verb must also be singular. If the subject is plural, then the verb must also be plural.
Answer: In the above sentence, 'cat' is singular. So the verb "chase" must also be singular. Therefore, the answer is 'chase'.

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Example: Do you think i should to go to atlanta?