. Useful expressions:
1. catch fire
Suddenly a pan of oil catches fire.
(be) on fire
The pan's on fire.
2. look out = be careful; watch out 用于祈使句。
Look out! There's a car coming.
3. in that case 假若那样的话；在那种情况下
In that case, you wouldn't have a pan on fire.
4. sound v. to give signal by making sound
Break the glass to sound the fire alarm.
*The music sounded terrible.
5. belong to = be own by
The fire also destroyed cars which belong to(=was owned by)people who
worked in it.
6. put out
Office workers tried to put out the fire.
7. be/get close to = be/get near to sb/sth
that firefighters could not get close to the building.
8. lose one's life
Over 220 people lost their lives in the fire.
B. Sentence patterns:
1. were/was doing when ( in the past tense) 正在 … 这时
Over 500 people were working in the building when the fire broke out.
2. it is/was + adj. + for sb to do
It was impossible for people on the floors above to escape.