There were so many people(=such a lot of people)in the room that we could not get in.

房间里这么多人以至我们进不去。

He bought so cheap a recorder that he saved some money.

他买了一台如此便宜的录音机，以致节省了一些钱。

2）所表示的条件根本不可能实现或者实现的可能性很小的时候，称之为非真实条件句，其主句和从句的谓语都要用虚拟语气，其基本形式按时态分类如下：

时态 If从句 主句 例句 现在时态 1）过去时（were）

2)过去时助动词+v.原形should+v.原形 would+v.原形

could+v.原形

might+v.原形 If I worked harder, I would succeed.

如果我努力去做，我就会成功的。（实际上没有努力） 过去时态 had+过去分词 should+have+v.过去分词

would+have+过去分词

could+have+过去分词

might+have+过去分词 You wouldn't have caught cold if you had put on more clothes.

如果你多穿点衣服的话，你就不会感冒了。 将来时态 were to+v.原形

should+v.原形 should+v.原形

would+v.原形

could+v.原形

might+v.原形 Should anyone call(If anyone should call)please take a message.

要是有人打电话的话，请留个信儿。 【辨析比较】1)so that既可以引导结果状语从句也可以引导目的状语从句。当从句中含有may, might, can, could, will, would, be able to等情态动词时，一般为目的状语从句;如：

The engineer didn't plan his time well so that he didn't finish the work in time.

这位工程师没有计划好时间，结果没能及时完成任务。（结果状语从句）

The engineer tried to plan his time well so that he could finish the work in time.

这位工程师精心计划时间以便能按时完成工作。（目的状语从句）

2)so...that...结构中that既可以引导结果状语从句也可引导定语从句。如：

This is so valuable a book that they all cherish it.

这是如此有价值的一本书，他们都很珍视。(结果状语从句)

This is so valuable a book that they all cherish it.

这是他们珍爱的很有价值的书。（定语从句）

3)判定的办法是看that在从句中是否充当成分，如果作代词充当从句的主语、表语或宾语为定语从句；如果是连词，不充当句子成分则为结果状语从句。

3. Hardly had we left the dormitory the next morning when we realized we forgot our map in the room.

第二天早晨我们刚离开宿舍，就想起把地图忘在房间里了。

【巧解句构】1)这是一个倒装句。正常语序是We had hardly left the dormitory the next morning when we realized we forgot our map in the room.

2)句中hardly...when...意思是"一......就......"，主句常用过去完成时，when引导的从句常用一般过去时。又如：

Hardly had I got home when it began to rain.