解答如下，認真在答題：
2017年：
He found it is hard to give up smoking.
Neither Tom nor Tim has seen this movie.
Is there a concert in school?auditorium?
The more trees we plant, the fresher the air is.
I want to know why he didn't answer the phone.
Although it is hot, workers don't stop working.
2018年：
Guess how long has my uncle had this robot.
Let's have a cup of coffee if you are free.
I still don't know how to use this cellphone.
Do you know when was trained invented?