do

Do is an auxiliary verb. It is used in questions, negative statements, short answers, and for emphasis when there is no other auxiliary.

Example: Questions

We sometimes use do in place of a different verb, such as when we do not know what an activity is, or we do not want to say it again:

Example: What is he doing?

When you do something, you perform, complete or work on a task.

Example: Mary is doing her homework.

To succeed or progress

Example: "How did John do in the tennis match?" - "He lost."

To write or draw something, usually in a short time

Example: He did a picture of a tree.