Form and rules
How it works
Use am with I, is with he/she/it and singular nouns, and are with you/we/they and plural nouns.
After be, we often use a noun, adjective, age, nationality, or place: She is a doctor. He is tired. They are at home.
Make negatives with not: I am not, he/she/it isn't, you/we/they aren't.
For yes/no questions, put am/is/are before the subject: Are you ready? Is Maria here?
Short answers use be too: Yes, I am. No, she isn't. Do not answer Yes, I do to a be question.