It isn't from the book but I think it is very useful.
When I
do/When I’ve done
When and if
Examples:
A: What time will you phone me tomorrow?
B: I’ll phone you when I get home from work.
“I’ll phone you when I get home from work” is a sentence with two parts:
The main part: “I’ll phone you”
And the when-part: “when I get home from work (tomorrow)”
The time in the sentence is future (“tomorrow”) but we use a present tense
(get) in the when-part of the sentence.
We do not use will in the when-part of sentence:
-
We’ll go out when it stops raining. (not “when it
will stop”)
-
When you are in London again, you must come and see us. (not
”when you will be”)
-
(said to a child) What do you
want to be when you grow up? (not “will
grow”)
