Page 606 - Practical English Usage 3ed - Michael Swan, Oxford

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for instance after if, whether and on condition that. after question words and relatives. and in indirect speech.
I'll write to her when I have time. (NOT ••• rtfflen I wiEl Mile tit7te.)
I'll think ofyou when I'm lying on the beach next week. (NOT ••• rtfflen : will
be lying . ..)
Will you stay here until the plane takes off?
It will be interesting to see whether he recognises you.
I'll have a good time whether I win or lose.
I'll lend it to you on condition that you bring it back tomorrow.
I'll go where you go.
Re says he'll give five pounds to anybody who finds his pen.
One day the government will really ask people what they want.
If she asks what I'm doing in her flat, I'll say I'm checking the gas. I think you'll find the wind slows you down a bit.
This can happen even if the main verb is not future in form. provided it refers to the future.
Phone me when you arrive.
Make sure you come back soon.
You can tell who you Ulee next week. but not until then.
In comparisons with as and than, present and future verbs are both possible. She'll be on the same train as we are/will tomorrow.
We'll get there sooner than you do/will.
present perfect: . .. when I've finished
The present perfect is used instead of the future perfect, to express the idea of completion.
I'll phone you when I've finished. (NOT ••• when " will Mile jinishetL)
At the end of the year there will be an exam on everything you've studied.
(NOT ••• €1Ie".thing)l61;1; wiEl Mile st'UtiietL)
future in subordinate clauses: ... where she will be
A future verb is necessary for future reference in a subordinate clause if the main verb does not refer to the future (or to the same time in the future).
I don't know where she will be tomorrow.
I'm sure I won't understand a word of the lecture.
I'll hide it somewhere where he'll never find it. (two different future times) Ifshe rings, I'll tell her that I'll ring back later. (two different future times)
For future verbs in if-c1auses (e.g. ]'/1 giue you £]00 ifit will help you to go on holiday), see 260. in case, , hope, , bet, it doesn't matter etc
A present tense is normally used with a future meaning after in case even if the main verb is present or past. For details. see 271.
I've got my tennis things in case we have time for a game tomorrow.
In an informal style, present verbs are often used with future meanings after I hope (see 250) and I bet (see 103).
I hope you sleep welL
I bet he gets married before the end ofthe year.
Present tenses are also used with future reference after it doesn't matter. I don't care, I don't mind, it's not important and similar expressions.
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tense simplification in subordinate clauses 580
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