(3) sentence structure: by引导的时间状语 As& with "随着"

2. Check the answers with group members and discuss the difficult points.

师导生学，释疑解难（师生互动）

I. words

Although I was young, I can simplify difficult sums.

sum n. 总数，总和；算术题；金额，钱数；

v. 共计，加起来

固定短语：in sum= in a word 总之

sum up 总结，概括

a large sum of 大量，许多（修饰不可数名词）

拓展：表示"总之"的短语有：

to sum up, in sum, in short, all in all, in a word, in brief

例句：

The sum of two and five is seven.

It will cost an enormous sum to repair the swimming pool.

In sum, the plan failed. 总之，这个计划失败了

He gave me a large sum of food. 他给了我很多食物。

Now, sum up your views in a few words.

Ⅱ. 重点短语句型突破

1. As the years have gone by, ... 随着

（1）go by 经过(某地)；(时间)过去；(机会等)失去；遵循，依据...