一般现在时
He often gets up at six.
He often gets up at six,doesn't he?
他经常六点钟起床,对吗?
现在进行时
Tom is doing his homework right now.
Tom is doing his homework right now,isn't he?
汤姆现在在做作业,对吗?
现在完成进行时
He has been sitting here all afternoon.(hasn't he)
他整个下午一直坐在这儿,对吗?
一般过去时
They went to the park yesterday.(didn't they)
他们昨天去公园了,是吗?
现在完成时
He has lived there since he was a child.(hasn't he)
他从孩童时起就住在那儿,是吗?