The verb follows the subject in a declarative sentence that it generally shows the action of the sentence. Note: Every sentence must have the verb. The verb may be single word.
John drives too fast.
They hate spinach.
The verb may be a verb phrase. The verb phrase consists of one or more auxiliaries and one main verb. The auxiliaries always precedes the main verb.
John is going to Miami tomorrow. (auxiliaries _is; main verb _ going)
Jane has been reading that book. (auxiliaries _has; been; main verb _ reading)
Examples of verbs and verb phrases:
She will go to Boston next week.
Jane is very tall.
She must have gone to the bank.
Mary is watching television.
It was raining at six o’clock last night.