Questions on Standard English are usually checking to see if you can spot where the correct form of the verb has been used. In Standard English, the verb will change its form to match the time that the thing happened or the subject of the sentence.
Example: the verb is ‘be’. If I’m hungry, it isn’t correct to write “I be hungry”. ‘Be’ changes to ‘am’. “I am hungry”.
I am, you are, he is, she is, we are, they are. These are all different forms of the verb ‘be’. These are what you should use if the action happens in the present.
I was, you were, he was, she was. These are also different forms of the verb ‘be’. You’d use these if the action happened in the past.
“Joe is hungry” is correct if Joe is hungry now, because ‘is’ is the correct form of the verb ‘be’.
“I is hungry” is incorrect because it should be “I am hungry” if I’m hungry now, or “I was hungry” if we’re talking about a time gone by.
“I will be hungry” is another option, if we want to talk about the future.