T: Now turn to the next homework. Any one to read out your answer?

S2: 2. Look, your brother has just come in.

　3. I have often tried to read War and Peace but I always stop because it's difficult.

　4. We have never visited the Greenland. What's it like?

　5. Peter has sometimes given me his homework on time but sometimes it has been late.

　6. Have you ever been to the cinema with Tom?

S3: 7. I haven't ever used that computer so I don't know what to do.

　8. They have already done the homework. Here it is.

　9. They haven't done the homework yet. It's for next week.

　10. I've worked here for ten years.

　11. I've worked here since 2000.

　12. I've worked here all my life.

T: Good. When we do this exercise, we should pay attention to some grammar points. In order to make myself well understood, I may use Chinese to explain the usage of adverbials, especially time adverbials.

1) already和yet都表示"已经"。但是，already用于陈述句，而且事情早先已经发生，或比期望发生的要早，它一般用在句子中间，但不能和时间状语放在一起。yet用来谈某事在预料之中，用于疑问句和否定句，一般放在句末。 例如：

The teacher is too busy．She hasn't had her lunch yet.

I haven't finished my homework yet.

2) ever用于疑问句或带if的肯定句中或含hardly等否定意义的肯定句中，表示"曾经"，一般要放在动词旁边；它不用现在完成时的简略回答，而要用Yes，I have或No，never来表示。never，hardly，seldom都是表示否定意义的副词，置于行为动词之前，或者两个动词之间。例如：

She doesn't like watching TV. She never watches TV.

她不喜欢看电视。她从不看电视。

副词在句子中的位置

1)多数副词可以放在动词后面，如果是及物动词，一般放在宾语之后。例如：

Don't worry. The boy can do it very well.