99.4 Write if or when. If I'm late this evening, don't wait for me.
2 I'm going to do some shopping now,
I come back, we can have lunch.
3 I'm thinking of going to see Tim. I go, will you come with me?
1
you don't want to go out tonight, we can stay at home.
5 Is it OK
I close the window
6 John is still at school
he leaves school, he wants to go to college,
7 Shall we have picnic tomorrow
the weather is goodi
8 We're going to Madrid next week. We haven't got anywhere to stay - we hope to find a
hotel
we get there. I don't know what we'll do
we don't find a room.

1. if - If I'm late this evening, don't wait for me.
In this sentence, "if" is used to introduce a condition. It means that there is a possibility that the speaker might be late in the evening, and if that happens, the listener should not wait for them.

2. when - I'm going to do some shopping now, when I come back, we can have lunch.
In this sentence, "when" is used to indicate a specific time in the future. It means that after the speaker comes back from shopping, they can have lunch together.

3. If - I'm thinking of going to see Tim. If I go, will you come with me?
In this sentence, "if" is used to introduce a condition. It means that the speaker is considering going to see Tim, and if they decide to go, they are asking the listener if they would like to come along.

4. If - If you don't want to go out tonight, we can stay at home.
In this sentence, "if" is used to introduce a condition. It means that if the listener does not want to go out tonight, the speaker suggests staying at home instead.

5. if - Is it OK if I close the window?
In this sentence, "if" is used to introduce a condition. It means that the speaker is asking for permission to close the window.

6. when - John is still at school. When he leaves school, he wants to go to college.
In this sentence, "when" is used to indicate a specific time in the future. It means that after John leaves school, he wants to go to college.

7. if - Shall we have a picnic tomorrow if the weather is good?
In this sentence, "if" is used to introduce a condition. It means that the speaker is suggesting having a picnic tomorrow, but only if the weather is good.

8. when - We're going to Madrid next week. We haven't got anywhere to stay - we hope to find a hotel when we get there. I don't know what we'll do if we don't find a room.
In this sentence, "when" is used to indicate a specific time in the future. It means that when the speaker and their companions arrive in Madrid, they hope to find a hotel. However, the speaker acknowledges that they do not have a plan if they are unable to find a room.