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Grammar: Conditional sentence 1

I'll phone you when I get home' is a sentence with two parts:

the main part: 'I'll phone you' and the when-part: 'when I get home'

The time in the sentence is future ('tomorrow'), , but we use a present tense (I get) in the when-part of the sentence.

We do not use will in the when-part of the sentence.

(not when it will stop)

When you are in London again, 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)

The same thing happens after while / before / after / as soon as / until or till:

I'm going to read a lot while I'm on holiday, {not while I will be)

I'll probably go back home on Sunday. Before I go, I'd like to visit the museum.

Wait here until {or till) I come back.

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 with it?

Don't say anything while Ian is here. Wait until he has gone.

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 phoned Kate, we can have dinner.

(= First I'll phone Kate and after that we can have dinner.)

Do not use the present perfect if the two things happen together:

When I phone Kate, I'll ask her about the party, {not When I've phoned)

It is often possible to use either the present simple or the present perfect:

I'll come as soon as I finish. or I'll come as soon as I've finished. D You'll feel better after you have or You'll feel better after you've had

something to eat something to eat.

After if, we normally use the present simple (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, {not if it will happen)

Hurry up! If we don't hurry, we'll be late.

Compare when and if:

We use when for things which are sure to happen:

I'm going shopping later, (for sure) When I go shopping, I'll buy some food.

We use if {not when) for things that will possibly happen:

I might go shopping later, (it's possible) If I go shopping, I'll buy some food.

If it is raining this evening, 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:

Читайте також:

1. A COMPOSITE SENTENCE
2. A) Practise using the words and word combinations in bold type to make other comparisons between some two-four regions of Russia. Write your best sentences down.
3. A. You will hear a manager interviewing a person for a job. Listen out for these verbs, and then use them to complete sentences 1-5.
4. And write your own sentences with the same words and phrases.
5. Are the following sentences true or false? If false, say why.
6. Are the following statements true or false? Correct the false sentences.
7. Are the sentences true or false?
8. Ask all the possible questions to the following sentences
9. B) Find 5 sentences in the text with the given word-combinations.
10. B) Make up sentences with the word-groups you have translated.
11. B) Use some of the word combinations from the box and make 5 sentences to describe the trial procedure.
12. B. Complex Sentence

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