8月30日下午15：38--15：51

He is difficult to understand.

Do you think it is safe to drink this water?

Do you think this water is safe to drink?

Your writing is awful. It is impossible to read it.

Your writing is impossible to read.

I like being with Jill. It's very interesting to talk to her.

Jill is very interesting to talk to.

跟名词：

This is a difficult question to answer.

(It's) nice (of you) to...

It was nice of you to take me to the station. Thank you very much.

It's silly of Mary to give up her job when she needs the money.

I think it was very unfair of him to criticize me.

表示对某事作出的反应：

I was sorry to hear that your father is ill.

Was Tom surprised to see you when you went to see him.

We were delighted to get your letter last week.

the first (person) to know, the next train to arrive

If I have any more news, you will be the first to know.

The next train to arrive at platform 4 will be the 6.50 to Cardiff.

Everybody was late except me. I was the only one to arrive on time.

可以说 something is sure/certain/bound/likely to happen:

She's very intelligent. She's sure/certain/bound to pass the exam.

I'm likely to be late home this evening.= I will probably be late home this evening.