1）It is the first / second time…… that…结构中的从句部分，用现在完成时。例如：

　　It is the first time that I have visited the city. 这是我第一次访问这城市。

　　This is the first time （that） I've heard him sing.　这是我第一次听他唱歌。

　　注意：It was the third time that the boy had been late.

　　2）This is +形容词最高级+that…结构，that 从句要用现在完成时。例如：

　　This is the best film that I've （ever） seen. 这是我看过的最好的电影。

　　典型例题

　　（1） ——Do you know our town at all？

　　——No， this is the first time I ___ here.

　　A. was　 B. have been　 C. came　 D. am coming

　　答案B. This is the first time 后面所加从句应为现在完成时，故选B.

　　（2） ——Have you ____ been to our town before？

　　——No， it's the first time I ___ here.

　　A. even， come　 B. even， have come　　C. ever， come　 D. ever， have come

　　答案D. ever意为曾经或无论何时，反意词为never，此两词常用于完成时。

　　注意：非延续性动词的否定形式可以与表示延续时间的状语连用。即动作不发生的状态是可以持续的。

　　（错）I have received his letter for a month.

　　（对）I haven't received his letter for almost a month.