（1）This/That/It is+序数词+名词+ that+现在完成时
例句
a. It is the third time that I’ve come to Beijing.
b. It is the fifth time that someone has knocked at my door.
c. —This is the tenth cup of coffee that I’ve drunk this evening.
— How are you going to be able to fall asleep later if you keep on like this?
（2）This/That/It is +最高级/ only修饰的名词+现在完成时
例句
a. This is the most interesting movie that I’ve ever seen.
b. “Oh Jesus, you’ve got the biggest cavity（ 洞 ） that I’ve ever seen!” the dentist exclaimed as he examined a new patient. “The biggest cavity I’ve ever seen!” The patient snapped（厉声说），“You don’t have to repeat it”. “I didn’t,” replied the dentist, “That was an echo.”
“天哪！这是我见过的最大的牙洞！”一位牙医在给一个病人检查时说道。“我见过的最大的牙洞！”病人厉声说：“你也用不着说两遍呀。”牙医回答说：“我没有呀，刚才那是回声！”
c. This is the best wine I have ever drunk.
d. It is the worst book I have ever read.
e. This is the hardest job I have ever had.
f.This is the only book he has written.
注意：在上述两种句型中，若是“It was the second/best…”，that后边的句子则用过去完成时态。例如：
It was the fifth time that someone had knocked at my door that night.
综上所述，现在完成时总是与现在有着密切的联系：或表示到现在为止这一段时间“一直在延续”或“重复发生”的动作或状态；或是表示影响现状的事件。