when and while are not different in form.

2. 1. BACKGROUND INFORMATION
We can use ‘while’ to introduce
a longer 'background' action or
situation, which was going on
when something else happened.

3.  A long action
was happening
(use the computer)
 then a short action
happened in the
past.
(the computer break
down)

4. > While my father was using
the computer, it suddenly
broke down.

5. - We use past continuous tense for
long actions.
- We use simple past tense for
short events.

6. Tim was taking a shower.
NOW
5:00 p.m.
7:00 p.m.
8:00 p.m.
The doorbell rang.
WhileTim was taking a shower, the
doorbell rang.

7. 2. SIMULTANEOUS LONG ACTIONS
We usually use while to say that
two longer actions or situations
went on at the same time.
 We use past continuous tense for
both actions.

8. Ali was eating.
NOW
5:00 p.m.
7:00 p.m.
8:00 p.m.
Ali was watching TV.
Ali was eating while he was watching TV.

9. 
I was drinking a cup of tea while my
friend was eating her toast in the
canteen.
 While you were reading the paper, I
was working.

10. 3. SIMULTANEOUS SHORT EVENTS
We can use when to say that two
short actions or events happened at
the same time.
 We use past tense for both
actions.

11. I opened my window.
NOW
5:00 p.m.
7:00 p.m.
8:00 p.m.
I saw a snowman in my garden.
I saw a snowman in my garden
when I opened my window.

12. 
I called the police when the car crush
happened.
 When I broke the vase, the baby woke
up.

13. John cooked supper while I
watched television.
Christopher read a book when
I was cooking in the kitchen.

14. When I was preparing my
presentation yesterday, I was
eating spaghetti with tomato
sauce.

16. NOT REALLY !!
Let us revise our
default
definitions given in
the earlier
slides .

17. TO SWAN;
 Past simple is not only used with
when, but also used with while
sentences.
John cooked supper while I watched
television.

18.  We can use both when and while to
introduce a longer 'background' action or
situation, which was going on when
something else happened.
Christopher read a book when I was
cooking in the kitchen.

19.  Progressive is not only used with while,
but also used with when sentences.
When I was preparing my presentation
yesterday, I was eating spaghetti with
tomato sauce.

20. Final Conclusion