1) They are not black in China, they are yellow.

Perhaps, that's why you (have get) so yellow yourself. When I (saw) you, I (said) to myself, why, he (has got) jaundice.

2) Just fancy, he (has not been) here for more than fifty years. He (has never seen)  my George, who is fifty-one next birthday.

3) He (was) a good-looking young fellow when he (left) but not so steady as his brother. But he  (has probably quietened) down by now.

4) I'm glad to see you (have got) here safely, Mr. Meadows.

He (was walking) here when he (got) to the gate, he (made) me stop the car and (said) he (wanted) to walk.