##### Unit 24. When I do / When I've done, When and if
~ 할 때,
#1. When I do (When)
"I'll call you when I get home from work" is a sentence with two parts:
- the main part : I'll call you and
- the when part : when I get home from work
We do not use will in the when part of the sentence.
+ We'll go out when it stops raining.
+ When you are in Los Angeles again, give us a call.
+ (said to a child) What do you want to be when you grow up?
b. The same thing happens after while / before / after / as soon as / until or till :
+ I'm going to read a lot of books while I'm on vacation.
+ I'll probably go back home on Sunday. Before I go, I'd like to visit a museum.
+ Wait here until(or till) I come back.
#2. When I've done (Present Perfect)
a. You can also use the present perfect(have done) after when / after / until / as soon as:
+ Can I borrow that book when you've finished it? 너 그거 끝낸거면 나 책 좀 빌릴 수 있을까?
+ Don't say anything while Ben is here. Wait until he has gone. 벤이 여기있는 동안 아무것도 말하지마. 그가 가기까지 기다려.
b. If you use the present perfect, one thing must be complete before the other (so the two things do not happen together):
+ When I've called Kate, we can have dinner.
(First I'll call Kate, and after that we can have dinner.)
Do not use the present perfect if the two things happen together:
+ When I call Kate, I'll ask her about the party. (not When I've called)
#3. When and if
a. If, we normally use the simple present (if I do / if I see, etc.) for the future:
+ It's raining hard. We'll get wet if we go out. (not if we will go)
+ I'll be angry if it happens again.
+ Hurry up! If we don't hurry, we'll be late.
b. Compare when and if:
* We use when for things that are sure to happen:
+ I'm going shopping later. (for sure) When I go hopping, I'll get some cheese.
* We use if for things that will possibly happen:
+ I might go shopping later. (it's possible) If I go shopping, I'll get some cheese.
+ If it is raining tonight, I won't go out. (not When it is raining)
+ Don't worry if I'm late tonight. (not when I'm late)
+ If they don't come soon, I'm not going to wait. (not When they don't come)
# Exercises
+ I'm going out now. If anybody calls while I am out, can you take a message?
+ I'll fine a place to leave to live. Then I'll give you my address.
=> I'll give you my address when I find a place to live.
+ I'll go shopping. Then I'll come straight home.
=> I'll come straight home after I do the shopping or I've done the shopping.
+ It's going to get dark. Let's go home before that.
=> Let's go home before It gets dark.
+ You want to sell your car. Jim is interested in buying it, but he hasn't decided yet.
You ask: Can you let me know as soon as you decide or you've decided?
+ The traffic is very bad in your town, but they are going to build a new road.
You say: I think things will be better when they build the new road or have built the new road.
+ We can eat at home, or if you prefer, we can go to a restaurant.