Answer:
- You are a good student
- She is my sister
- I am a teacher
- He is Italian.
Step-by-step explanation:
In 1 above, are functions as a Linking Verb. The phrase a good student is a state of being and provides additional information (in third person singular) about the subject "You".
The same explanation goes for is and am.
Please note: Any word which in a sentence, that is used to connect a subject to an additional information about the subject is called a Linking Verb.
Cheers!