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The room, although supposed to be kept locked, was often left open.
然后让学生总结句中过去分词的用法，通过归纳，学生会总结出：句中过去分词均作状语，并且可作时间状语，原因状语，条件状语，方式状语，伴随状语或用在连词后。这样比教师直接告诉学生过去分词的用法要好得多。
（2）对比指导法
教学中教师除及时点拨，引导学生发现语言规律外，对一些相似仍又有不同的语言点，教师可引导学生进行对照比较，弄清它们的区别，加深对语言现象的印象。
以学 "a great deal of"的用法为例：
教师可叫学生比较"lots of", "a lot of", "plenty of", "a large quantity of", "a large number of" 和"a large amount of"的用法，让学生比较下列句子：
①We have still plenty of eggs left.
We have still plenty of water left.
②The rich lady has large quantities of clothes.
We have large quantities of rain this summer.
③She has spent a great deal of (a large amount of) money on her
clothes.
④A large number of settlers from France reached Canada in 1534.
⑤There’s lots of rain here in spring.
At noon lots of students go to the reading-room to read.
通过比较这些句子，学生会明白 “lots of”，“ a lot of”，“plenty of” 和 “ a large quantity of" 可以用在可数名词和不可数名词前， “a great deal of ”和 “a large amount of ” 只可用在不可数名词前， “a large number of ”只可用在可数名词前。
（3）解答说理法
提出一种语言现象，一个问题，让学生分析这种现象，寻求正确答案，并找出选相应答案的理由，这是培养学生思维能力的一种手段。
（4）启迪思维法
我们要培养学生创造思维品质，培养创造的方法与才能，只让学生打勾勾，划叉叉，寻求标准答案是不行的。创造的火花多产生于求异之中，产生于发散思维之中。这种创造品质需要多角思维的方法去训练。
（5）讨论活动法
讨论法可用于解决学生对语言现象的疑问，对课文的理解，也可用来对语言现象的操练、深化。学生在讨论活动中互相启发、互相学习，不断提高语言活动的质量。
例如，在学主语从句时，可让学生分组讨论下列句子中所含从句有什么共同点：
Who will go to the conference is not important.
What we need is more time.
How they went to the USA remained a question.
When the power station will be ready is uncertain.
Why he took Swiss nationality is a question that interests us.
Whether the other scientists would accept his ideas was unknown.
It was quite clear that it was impossible for him to live in Germany.
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