it is the first time that是什么句型

就是一个特殊的句型，主要考察that后面的用法。
一般说来,在It [This] is the first time＋that-结构中,that-从句通常用现在完成时：
It’s the first time (that) the boy has spoken to a foreigner.这个男孩还是第一次同外国人说话.
It’s the first time that she’s seen an elephant.这是她第一次见到大象.
有时以上结构中的 first 也可换成 second,third,fourth 等；其中的time也可换成其他名词：
It’s the first month that he has lived here.这是他第一个月住在这里.
This is the second cigarette that he has smoked today.这是他今天抽的第二支烟.
若It was the first time that-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.
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就是一个特殊的句型强调句，主要考察that后面的用法。
一般说来,在It [This] is the first time＋that-结构中,that-从句通常用现在完成时：

It was the first time that she had sung in public. 那是她首次公开演唱。

It was the first time that she had lived independently. 那是她第一次独立生活。

It was the first time that he had wept in nineteen years. 那是他19年来第一次流泪。

It was the first time that I had written with real passion. 这是我第一次满怀热情写作。

It was the first time that the black boy had tasted freedom. 这是黑人男孩第一次尝到自由的滋味。

It was the first time that little Franz had listened so attentively. 那是小弗朗士第一次如此用心地听讲。

This was the first time he had confronted an armed robber. 这是他第一次面对一个武装劫匪。

This was the first time I had been treated with such respect. 我是第一次受到这样的礼遇。

She was astonished; this was the first time she had heard of such things. 她大吃一惊；她第一次听说过这样的事。

从句哦，第一次做某事。