e.g. He fell down from the tree, struck the ground heavily and fainted.

The clock struck five and people in the city knew it was time to go home.

3. be linked to... / be related to .../ be connected with ...：和......有关、与......有联系。

be linked (to ...)：和......联系起来、和......有联系

　e.g. If two things are linked, they are related in some way

　　　Police think the murders are linked.

Some birth defects are linked to smoking during pregnancy.

The story of Harmon is linked to that of the Hexams by the river Thames.

　*be closely/directly/strongly... linked

　e.g. Our economy is closely linked with the surrounding countries'.

be related to ...：和......有关、有联系、有亲戚关系

e.g. Are you related to the rich lady?

The young girl is said to be related to the fire last night.

The Blacks are related to the Smiths by marriage.

related：相关的、有关系的

e.g. He showed us some writings related to the murder case.

He asked me some more questions related to the problem.

　be connected with ...：和......有关、有联系。

　e.g. He was also connected with the government.

　 I'm no longer connected with the company.

　 The visit of the police was not connected with the lost boy.

　be connected to...：接通电话、电源。

　e.g. I was again connected to the wrong person.

4. still / quiet / silent

still：修饰环境时，指完全没有声音；修饰人时，指一动不动；还可以修饰物，强调物体位置未发生转移。

e.g. After that, all was still.

Stand still while I'm taking your picture.

quiet：修饰环境时，指没有吵闹干扰；修饰人时，指性情温和、安静，有时也指人闲散、不活动。

e.g. It was a warm, quiet and drowsy afternoon.

She is a quiet girl at school and we all like her.

silent：寂静的、无声的，沉默的、不发音的。

e.g. It was silent in the classroom.

Cats walk on silent feet.

Her cough broke the silence and everyone else looked in her direction.

5. pay back / pay off / pay for / pay up

pay back：偿还

　e.g. When will you pay my money back?

He is now out of work and could not pay back the loan.

　pay off：全部还清、得到报偿:

　e.g. I paid off all the money last week.

I feel all my work has paid off.

pay for：付......的款，常用句型： pay (sb.) money for (doing) sth.