In English, every sentence, with rare exceptions, should have both a subject and a verb.

H-93

If your native language allows you to omit either subject or verb, check your drafts carefully to be sure that you include both in your writing. Supply both a subject and a verb in each sentence, but do not repeat the subject or other words that duplicate grammatical functions.

Add a missing subject.

Add a missing verb.

Supply a missing expletive (there or it) if the subject follows the verb.

Delete a repeated subject.

Delete other words that repeat grammatical functions.