Point out the linking verbs.

1. I am Tom.

2. Surfing the Internet is really interesting.

3. We are now in need of English teachers.

4. The question is how to solve the problem.

5. What we want to know is who will give us the lecture next Monday.

6. Your suggestion sounds reasonable.

7. It seems that everyone here knows him quite well.

8. Milk goes bad easily in summer if you do not put it in the fridge.

连系动词（即系动词）用于连接主语和表语，说明主语的状态、性质、特征或身份。常见的系动词是be,它的变化形式为：am、 is、 are (现在时) 和was、were (过去时)。 除了be 动词之外还有一些系动词，他们大致可分为四类：

1. 表示" 似乎", 如：appear , seem

e.g.:

She appears / seems all right.

They appear / seem in favour of the Internet.

He appears / seems to be very friendly with us.

They appear / seem to have misunderstood me.

It appears / seems that she will win.

It appears / seems to me that you are all mistaken.

试比较：

He seems (to be) forty.(说话人有一定根据)

He appears (to be) forty. (从外表上看)

2. 表示"感觉", 如: look, sound, feel, taste, smell

e.g.:

That sounds wonderful, but some people claim that the Internet is a waste of time.

If you always eat fast food, vegetables may not taste delicious to you.

It feels good to sit in front of the TV after a hard day's work.

When he got up on stage, he looked a little nervous.

The air often smells bad in Internet cafes.

3.表示"变化", 如: become, come, get, grow, turn, fall, go

e.g.:

Leaves turn green in spring.

The boy will go mad if you don't allow him to use the computer.

Your son has grown much taller.

He gets easily excited when playing computer games.

She fell asleep the moment she got into bed.

4. 表示其他含义, 如: keep, remain, stay, stand, prove

e.g.:

The Internet proved of great value to us during our project.

You shouldn't keep quiet in a debate.

People stayed silent and listened to us, and applauded at the end.

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