关于现在完成进行时和现在完成时的翻译句子

1.I have been waiting for you at the school gate for 3 hours in such hot weather.
2.I have been studying hard day and night since I entered high school.
3.How many times has this old professor been to America?
4.How long have you been living alone in this small town?
5.They have mastered many skills for study so far.
6.This is the first time that we have experienced such a serious failure.

1.I have been waiting for you at the gate for three hours in such hot weather.
2.I have been working hard day and night since high school.
3.How many times has the old professor been to America?
4.How long have you been living alone in this small town?
5.So far, they have mastered many learning skills.
6.This is the first time that we have experienced such a failure.