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A noun is used as the subject of a sentence or a clause, and as the object of a verb or a preposition.Examples:The present is for my niece's birthday. (subject of the sentence)In the time that the present allows we can accomplish a lot. (subject of the clause)He wrapped the present before I could see what is was. (direct object of the verb)You can park your car here for the present. (object of the preposition)
The verb in the given sentence, "could be" is in a conditional present tense.
A sentence missing a subject or a verb is a fragment.
It could be.
It could potentially be the subject of a sentence, if that is what you mean.
The essential parts of a sentence are the subject and the predicate. The subject of a sentence refers to who or what the sentence is about. The predicate is the verb that shows an action. For example, in the sentence 'Bob sneezed.', the subject is Bob and the predicate is sneezed.
Subject personal pronouns are I, he, she, it, we, you, and they.
he was subject to an investigation
"He could not have been there" is the correct sentence. It conveys the idea that he was unable to have been at the specified place.
Biology was a subject I studied a school.
The subject is I.
Yes, it could. Example: This is awesome!