С Why, what, whose, whichand whether

We cannot use why before a to-infinitive.

No one could explain why we had to wait, not No one-could explain why to wait.

After what, which, whose, how many and how much, we can use a noun. Sarah and Mark were discussing what colour to paint the walls. We wondered whose story to believe — both drivers said it wasn't their fault. It's difficult to know how much luggage to take with you.

We can use whether but not if.

We'll have to decide whether to go ahead with the project (or not).

NOT We'll have to decide if to go ahead.

Melanie wasn't sure whether to ring the doctor or not.

I was wondering whether to order some tea.

66 Exercises

1 Structures with what to do, where to go,etc (B) Comment on these situations.

► (not know) He doesn't know how to switch the computer on.

1 (can't think)...................................................................................................................................................................

2 (not sure).................................................................................................................................................................

3 (not know)..................................................................................................................................................................

2 Structures with what to do, where to go, etc (B)

Look at the questions and then complete the paragraph about a man coming out of prison. Use a question word and a to-infinitive.

► How should he start a new life? 3 How can he find somewhere to live?

1 What can he expect? 4 What should he do?

2 Where should he go? 5 Who can he contact?

This man will have problems when he leaves prison. He needs advice on (►) how to start a new life.

After a long time in prison, he isn't sure (1)......................................................... in the outside world and he has

no idea (2).................................................. He doesn't know (3)..................................................... a place to live either.

But he won't be completely alone. A social worker will advise him (4).............................................................,

so he'll know (5)................................................. if he needs help.

3 Question word + to-infinitive (B-C)

You are finding it very difficult to make your mind up.

Complete your answers to the questions. Use a question word and a to-infinitive.

► Rachel: Are you going to buy that sweater?
You: I don't know whether to buy it or not.

► Tom: What time do you think we should leave?
You: I'm not really sure what time to leave.

1 Daniel: Do you want to do business studies?

You: I'm wondering................................................................... business studies or statistics.

2 Vicky: How much money should we spend on the present?
You: I've no idea................................................................. on it.

3 Matthew: Do you intend to join the sports club?

You: I can't decide............................................................... it or not.

4 Vicky: Which route should we take?

You: It's difficult to know...................................................................

5 Melanie: Which lottery numbers are you going to choose?
You: I haven't decided..................................................................

66 Adjective + to-infinitive

A Introduction RACHEL IS HAVING A DRIVING LESSON.

We can use a to-infinitive (e.g. to be)after an adjective (e.g. great).

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