English Grammar in Use Fifth Edition

25.4
  Put in 
when
 or 
if
.
1
  Don’t worry 
if
 I’m late tonight.
2
  Be careful.  You’ll hurt yourself 
 you fall.
3
  I’m going shopping.  
 you want anything, I can get it for you.
4
  I’m going away for a few days.  I’ll call you 
 I get back.
5
 
 I don’t see you tomorrow, when will I see you again?
6
  I’m watching a programme on TV right now.  
 it finishes, I’m going to bed. 
7
  We can eat at home or, 
 you prefer, we can go to a restaurant.
8
  I hope Sarah can come to the party.  It will be a shame 
 she can’t come.
➜
 Additional exercises 12–15 
(pages 309–11), 
32 
(page 321)
51

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can
,
 could
 and (
be
) 
able to
We use 
can 
to say that something is possible or allowed, or that somebody has the ability to do 
something.  We use 
can 
+ 
infinitive 
(
can do 
/ 
can see 
etc.):
We 
can see 
the lake from our hotel.
‘I don’t have a pen.’  ‘You 
can use 
mine.’
Can 
you