强调第几次的英语句式结构是什么,包括后面的时态也要解释清楚哦,我就是搞不懂 前面的谓语动词i

句型通常有两个:
1.This/It is the first/second...time that ...(从句用现在完成时态)
2.This/That/It was the first/second...time that ...(从句用过去完成时态)
但是有时候从句中的时态也有其他变化,请对比翻译下面不同情境下的句子:
(上课前老师对同学们说)这是我最后一次给大家上课了.
This is the last time that I will give you the lesson.
(课结束时老师又对同学们说)这是我最后一次给大家上课了.
This is the last time that I have given you the lesson.
(事后回忆起往事时,老师再对同学们说)那是我最后一次给大家上课了.
That was the last time that I had given you the lesson.