帮帮忙中译英（请不要用软件翻译，谢谢）。就4句，谢谢

1.有个警察在和你招手是吗？你刚才肯定超车了。 If you see a police wave to you that means you must have overspeed just now.
2.他们不可能是我们学校的学生，我没健过他们。 They can't be the students in our school, since i never seen them before.
3.昨天下午他肯定没打扫教室. He definitely must not clean the classromm yesterday afternoon.
4.你爸妈肯定退休了，是吗？Are you parents got retired now, aren't they?

1.Is there a policeman shaved with you? You must overtake just now.
2.They can not be our school\'s students, I haven\'t see them before .
3.He unlikely swept the classroom yesterday afternoon.
4.You parents must retire, is that right?

正确答案：

1 Was a police officer signing to you?then you must be speeding.
2 They can't be going our school,cos i've never seen them before.
3 He sure didn't clean the classroom.
4 Your parents must have retired, have they?

Is there a policeman waving at you?You must have been overspeed.
They can't be