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If she left her husband, she would be happier (but I think she is not going
to leave her husband)
ZERO CONDITIONAL
There is another conditional called zero conditional.
FORM
IF+ Present Simple Present simple
If your press the button, the machine switches off
Or Present simple IF+ Present Simple
The machine switches off If you press the button
USE
a) For instructions
a. If the camera is on, a red light appears
b) For general truths
a. He always says hello if he sees you
SHOULD
It is the verb we use to recommend, suggest, give advice and opinions.
You should go to the doctor (it is a recommendation).
You should say sorry to him (it is a piece of advice).
We also use SHOULD to talk about what we think it is going to happen or it should
happen; and to talk about things we do not like because they are not what we expect.
They should be here at ten o´clock (it is what I think it is going to happen)
They should win this match; they are a much better team (it is not what we expect)
