يفهم

My (female) friend understands Arabic well, and I understand it a little.

Do you understand this lesson in the book?

Do you understand Arabic well?

This lesson is new, but I understand it well.

If you did not understand the question, ask the professor after the lesson.

I did not understand the reason for this decision, then I understood the idea after the meeting.

After the lesson, I understood the question and wrote the answer on the page.

If I do not understand the program, I need help.