几个英语题

Question

（1）this is the first time that i have heard him sing?为什么填的是have heard ，麻烦讲清楚一点。
（2）how can i leave ? it is snowing hard outside . besides i believe my mother is coming to pick me up 。为什么填is coming ??
求个高人 讲解一下 谢谢了

Answer 1

1、很重要的句型：
it/this is the ...time that ...have done sth
it/this was the ...time that ...had done sth

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。

Answer 2

因为是到目前为止第一次听过，所以是完成时。
现在进行时表示的是将来时的含义。