1.一般说来, 在It [This/That] is the first time＋that-结构中, that-从句通常用现在完成时：
This is the first time she has experienced disappointment
It's not the first time that you've found yourself in this situation
It's the first time farmers have decided to organize.
It's the first time I, a fair-skinned, freckly type, have sailed in the sun without burning
This is not the first time his exploits have landed him in trouble.
It's the first time we've been to the cinema together as a family.
It's the first time at these games that the Americans have overtaken the Cubans
This is the first time ( that) I've acted on the stage.
It’s the first time (that) the boy has spoken to a foreigner.
It’s the first time that she’s seen an elephant.
—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
2.有时以上结构中的first也可换成second, third, fourth等；其中的time也可换成其它名词：
That is the second time you have made that observation.
It’s the first month that he has lived here.
This is the second cigarette that he has smoked today.
3.若It/This/That was the first time that-类似结构中, that-从句通常用过去完成时, 有时也用一般过去时, 有时若有包括现在在内的时间状语, 偶尔还可用现在完成时：
I was lucky because that was the second time I(had) visited Japan that year. 我很幸运, 那是我那年第二次访问日本。
It was the first time this year that he hadn’t[hasn’t] worked on a Saturday. 这是今年来他第一次在星期六不上班。
It was the first time she had ever spoken before such a big audience.
He's not to blame. After all, it was the first time he'd done it.
It was the first time a Japanese manufacturer had topped the list for imported vehicles
It was the first time she'd had a chance to think it through.
That's the first time I lost my cool in 20 years in this job. This whole thing's getting to me.
It was the first time we admitted to ourselves that we were tired.
It was the first time I had put it all down on paper. I found it helped.
It was the first time Jane and I had been apart for more than a few days
It was the first time she had seen him in person.