In English, we use ''am,'' ''is,'' and ''are'' as the present simple forms of the verb ''to be'':
''Am'' - Used with ''I''
Example: I am c.
Incorrect: I is happy.
''Is'' - Used with he, she, it (singular subjects)
Example: She is a doctor.
Incorrect: She are a doctor.
''Are'' - Used with you, we, they (second person singular and first, second, third person plural subjects)
Example: They are my friends.
Incorrect: They is my friends.
Tip:
We use contractions in spoken English:
I am - I'm
You are - You're
He is - He's