The high wind passed and the sea was calm again.

The police chief advised his men to stay keep calm and not lose their tempers.

There was a calm on the sea.

She calmed the baby by giving him some milk.

We calmed the old lady down.

Useful expressions:

1.       add up to join (numbers or amounts ) so as to find the total.

Add up 3, 4 and 5 and you'll get 12.

Add up your score and see how many points you can get.

If we add these marks up, we'll get a total of 90.

2.      calm down

to make or become calm

Calm down, sir. What's the trouble?

Just calm down, there’s nothing to worry about!

We tried to calm him down, but he keep shouting.

3.      be concerned about with

to worry or interest

My parents are concerned about my studies.

Don’t concern yourself about with other people’s affairs.

She’s concerned about his son’s future.

4.      go through

1) to suffer or experience; 2) to look at or examine carefully;

3) to pass through or be accepted

The country has gone through too many wars.

The new law did not go through.

Let’s go through it again, this time with the music.

5.      set down

1) to make a written record of; write down  2) put down

I have set down everything that happened.

I will set down the story as it was told to me.

Please set me down at the next corner.

6.      a series of + pl. & n 做主语时，谓语动词用单数

一连串的，一系列的，连续的

There has been a series of car accidents at the crossing.

These days I have read a series of articles on reading.

A series of TV play is on Channel 1 these days.

7.      on purpose

intentionally; with a particular stated intention

He did it on purpose.

“I am sorry I stepped on your toe; it was an accident.” “It wasn’t! You do it on purpose.”

I came here on purpose to see you.

8.      according to

as stated by sb. or sth.

They divided themselves into three groups according to age.

Please arrange the books according to size.

According to the Bible, Adam was the first man.

According to her, grandfather called at noon.

9.      fall in love

begin to be in love (with sb.)

They fell in love at once; it was love at first sight.

What will he do if his daughter falls in love with a poor man?

They fell in love with each other for years.

10.  join in

to take part in (an activity)

They are going to join in the singing.

She started dancing and we all joined in.

Would you like to join in my birthday party?