用于现在完成时的句型

1）It is the first / second time…. that…结构中的从句部分，用现在完成时。
　 It is the first time that I have visited the city.
　 It was¹ the third time that the boy had² been late.

2）This is the… that…结构，that 从句要用现在完成时.
　 This is the best film that I've (ever³) seen⁴.
　　　 这是我看过的最好的电影。
　 This is the first time (that) I've heard him sing.　这是我第一次听他唱歌。

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. came⁵　 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. even⁶, 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。 This is the largest fish I have ever seen. It is / was the first time +that-clause 的句型中，从句要用完成时。
　 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 received⁷ his letter for a month.
（对）I haven't received his letter for almost⁸ a month.