I don 't know the man. The man is talking with our headteacher(改为含有定语从句的复合句)
I don't know the man talking with our headteacher.
All my classmates went to the old people's home (除了)Enic because he was ill.
The Blacks are going to have their garden (浇水) this weekend.
His father always (鼓励)him to face the failure bravely.
It's good to have a (健康的) eating habit.
John is interested in (化学)