Sentences have such things as verbs and subjects. Words, however, can be of many different types. There are adjectives and adverbs, conjunctions, prepositions, and others. Sentences, if that is what you really wanted to ask, always have both a verb and a subject, but those may not be stated explicitly; they can be implied.
All sentences require a verb. In the sentence "You aren't gay," "aren't" breaks down to "are not," and the word "are" is a verb linking to "not."
Imperative sentence have no subject:
Watch out! Sit down. Have one of these.
The subject is you it is implied: (You) sit down!
Were is the verb in that sentence.
Ran is the verb in that sentence>
Startled is the verb in your sentence.
If the verb is the whole sentence, then it is not a sentence, but a sentence fragment. A sentence requires at least a subject and a verb. Examples of Sentence Fragments: Run. Hide. Watch.
The verb in that sentence is describes.
The verb in the sentence "How are they different" is "are."
The verb is the action word in a sentence that describes what the subject is doing.
The verb in that sentence is "are".
Were is the verb in that sentence.
Depending on the context, sentence is already a verb For example, "to sentence someone" is an action and therefore a verb.
'Needs' would be the verb in this sentence.
Yes, it is possible to have a sentence with a verb and without a helping verb. For example, "He runs every day" is a sentence that contains the verb "runs" without a helping verb.
the verb in the sentence is has
There is no verb in that fragment - it is not a sentence.
Ran is the verb in that sentence>
Startled is the verb in your sentence.
No its not. A sentence must have a verb and a subject. There is no verb in that sentence.