同学你好，该知识点来自沪江网校《新概念英语1、2、3、4册连读标准会话【随到随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
这里不是定语从句，“正是天气耽误了项目”，跟“我们”没有关系的，不是“耽误项目的我们”，后面的句子不是修饰us的。

这是强调句，强调句型的基本结构是“It is / was +被强调部分+ that / who+ 句子其余部分”。其中，被强调的可以是主语、宾语、状语等，如果被强调的是人用that或who，其余情况用that。如：

针对I met Li Ming at the railway station yesterday.句子进行强调。

强调主语：It was I that （who） met Li Ming at the railway station yesterday.

强调宾语：It was Li Ming that I met at the railway station yesterday.

强调地点状语：It was at the railway station that I met Li Ming yesterday.

强调时间状语：It was yesterday that I met Li Ming at the railway station.


在使用强调句型时须注意的几个问题：

(A) 原句子是现在时或将来时，强调句用It is + 被强调的部分 + that (who)…; 若原句子是过去时，强调句用：It was + 被强调的部分 + that (who)…

(1) Li Lei’s father will work in America. —It is in America that Li Lei’s father will work. 李蕾的父亲的工作将就在美国。

(2) I studied at this school a few years ago. —It was at this school that I studied a few years ago. 几年前我就在这所学校读书。

(B) 即使被强调的部分是复数，It后面始终用单数形式。如

(1) Tom and Lucy gave us much help. —It was Tom and Lucy that gave us much help. 正是汤姆和露西给了我们很多的帮助。

(2) I saw swans in the lake yesterday. —It was swans that I saw in the lake yesterday. 昨天我看到在湖里的就是天鹅。

(C) 强调人时，可用who 代替that, 但若强调时间、地点、原因、方式时，不能用when, where, why, how代替 that。如：

(1) It is our teacher who / that helps us make great progress. 正是我们的老师帮助我们取得了很大的进步。

(2) It is by bus that I go to school every day. 每天我就是乘公共汽车上学。

(D) 在强调not…until结构中的时间状语时，应将not移到until前，再将not until部分移到被强调的位置。如：

I didn’t go to bed until twelve o’clock last night. — It was not until twelve o’clock last night that I went to bed. 昨天晚上我一直到十二点才睡。

祝同学学习进步~