Is.
There is no such word, or a need for one. The word "sponsor" is already a noun applied to a person, group, or company.
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.
Frank was your sponsor
The past tense would be Frank was your sponsor.
There is no such word, or a need for one. The word "sponsor" is already a noun applied to a person, group, or company.
The verb in the sentence "How are they different" is "are."
Under Armor is a sponsor of the Temple University sports teams.
Is is the verb in your sentence.
noone cares
The noun and the verb are both spelled sponsor.
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.