5. though引导的从句，可用倒装语序，即把从句中的表语或状语放到though之前；although却不能这样用。如：

　 Young though she is, yet she is fit for the job. (=Young as she is, yet she is fit for the job.)尽管她很年轻，可她还是胜任这项工作的。

4. though有时指假设的情况，不指事实，从句用虚拟语气；although不能这样用。如：

　Einstein cared little for money, though he could have been very rich. 尽管爱因斯坦本可以成为非常富有的人，但他对金钱却不感兴趣。(though引导的情况是假设的而不是事实。)

　He will never do such a thing though he (should) be forced to. 即使强迫他，他也决不会干这样的事。(注意：不能用is)

3. although, though引导的从句不能与but, however连用，但可与yet, still连用。不能说：Though he was old, but he worked hard. 应把but去掉。当然，保留but而去Though也可。

2. although和though引导的从句放在主句前后均可，有时还可放在句中。如：

He often helps me with my English (al)though he is quite busy. 尽管他相当忙，但是还常常帮我学英语。

　Although many difficulties are still ahead, we are determined to make GREater achievements. 尽管在前面的道路上还有许多困难，但是，我们决心要取得更大的成就。

1. although较正式，语气强；though较常用。现代英语中两者可随意换用。如：

　Though he was tired, he went on working. =Although he was tired, he went on working.

3.　　 need to do sth. (need作为动词时后接动词不定式的用法)

2.　　 掌握“in order to” and “as a result”的用法：前者表示目的，引导动词不定式；或者表示结果，后面有逗号，接一个完整的句子。

1.宾语从句。(注意：时态、语序、人称三个方面)

③、特殊疑问句作宾语从句。　　　 (①②在9BUnit 1已经学过)

特殊疑问句作宾语从句时一定要注意用陈述句语序。时态根据主句而定。

(但如果是真理或客观事实则用一般现在时，不需要改变。)

特别注意有些特殊疑问句本身就是陈述句语序(因特殊疑问词作主语)，如：

　Who is on duty?　　　　　　 What’s wrong with you?　

What’s the matter with you?　 What happened to you?　 等等。

21、

20、Clear up an mess in my bedroom.