Page 125 - Basic English Usage

—
125 168 170

Cc. past perfect (| had + past participle |) to refer to the past
If only she hadn't told the police, everything would have been all right.

168 if so and if not

We can use these expressions instead of repeating a verb that has
already been mentioned.
Are you free this evening? If so, let’s go out for a meal.
(=... lfyouare ...)
| might see you tomorrow. If not, then it'll be Saturday.
(=... Ifldont...)

169 ill and sick

li means ‘unwell’.
I'm sorry | didn’t answer your letter. I've been Ill.
We do not use /// before a noun. Instead, we can use sick.
She spent years looking after her sick mother.
We can use be sick (in British English) to mean ‘bring food up from the
stomach’. If you fee/ sick, you want to do this.
| was sick three times in the night.
| feel sick. Where's the bathroom?
She's never sea-sick.
in American English, be sick means ‘be ill’.

170 imperative

When we say Have a drink, Come here or Sleep well, we are using
imperative verb forms: have, come and si/eep.
Imperatives have exactly the same form as the infinitive without to. We
use them, for example, for telling people what to do, making
suggestions, giving advice, giving instructions, encouraging people,
and offering things.
Look in the mirror before you drive off.
Tell him you're not free this evening.
Try again — you nearly did it!
Have some more tea.
Negative imperatives are made with don’t or do not.
Don’t worry — everything will be all right.
Do not lean out of the window.