他离开一会儿英语

He has been away for 10 minutes.

He has (already) left for ten minutes.

He's not been here for two hours.

sometime:在某一时间e.g.We will visit you sometime last week.译：我们会在下周的某个时间来看望您。sometimes：有时e.g.I usually go to cinema on Sunday,but sometimes I stay at home.译：我通常会在星期天去看电影，但是有时候我会待在家里。 some time：经过若干时间some times:几次

he has been away for two hours时间段只能和时间段连用，不能用leave 也可以说是he left two hours ago

sometime通常用于将来的，有一天；sometimes是有时：some time 是有些时间；some times 好象很少见，应该是几次的意思吧一会儿的英文应该是：A while,A seconds A minute.如果是一会儿之后呢，就在这些词组前面加after.( 我是英语科代表拉^-^

He is gone.He left.