I want to know, when we can use (do,are,is am) to do a question?

Use is when the subject is a singular noun or a third person singular pronoun. Examples She is my best friend. John is a clever boy. He is writing a letter. Mother is cooking dinner. Father is working in the garage. It is a dog.

Use am when the subject is the first person pronoun I. I am a teacher. I am working on my computer.

Do We use do when the subject is I, you, we or they. Do I know you? Do you come from England? Do we have to cut the grass? Do they want to come with us?

Use are when the subject is a plural noun or a plural pronoun (e.g. we, you, they). You are wonderful. They are waiting for us. We are preparing for the test. Boys are playing in the garden. The students are learning their lessons.