--I’m worried about my English. -- ______ harder ________ you will catch up with your classmates.

Your brother helped the little boy,       he?

        do you play tennis?   I play it three times a week. 

– David’s seldom late for school, ______ he? -- ______, even though the weather is very bad.

--You didn't go to school yesterday, did you?  --_____, though there was a heavy rain.