it is/was the first time that有什么用法

it is/was the first time that有什么用法 it is/was the first time +that+clause中从句用什么时态? It was the first time that I ----- ------ ----- ----- ------ it is the first time 用法 it is the first time 句型用法 It is the first time that从句做什么成分 it was the first time that I had seen the sea和it is the firs 用以下的短语造句..there was a time when..it is the first time that.. this is the first time this was the first time 怎么用,有什么区别? It is the first time that he (is \was)late for school 用 it is/was the first time that＋过去完成时造句 It is /was for the first /second ...time that sb.do /did sth