Brugen af "Unless"

Unless betyder det samme som if...not. Ligesom if bliver unless efterfulgt af nutids-, præteritums- eller førdatidsform (aldrig af konditionalis). Unless bruges i stedet for if...not i alle typer konditionalis sætninger. Bisætningerne rækkefølge spiller ingen rolle i sætninger med unless.

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Type 1 konditionalis: Unless + nutid

Med If	Tilsvarende med Unless
You will be sick if you don't stop eating.	You'll be sick unless you stop eating.
I won't pay if you don't provide the goods immediately.	I won't pay unless you provide the goods immediately.
If you don't study dilligently, you'll never understand trigonometry.	Unless you study dilligently, you'll never understand trigonometry.

Type 2 konditionalis: Unless + præteritum

Med If	Tilsvarende med Unless
If he wasn't very ill, he would be at work.	Unless he was very ill, he would be at work.
I wouldn't eat that food if I wasn't really hungry.	I wouldn't eat that food unless I was really hungry.
She would be here by now if she wasn't stuck in traffic.	She would be here by now unless she was stuck in traffic.

Type 3 konditionalis: Unless + førdatid

Med If	Tilsvarende med Unless
Our director would not have signed the contract if she hadn't had a lawyer present.	Our director would not have signed the contract unless she had had a lawyer present.
I wouldn't have phoned him if you hadn't suggested it.	I wouldn't have phoned him unless you'd suggested it.
They would have shot her if she hadn't given them the money.	They would have shot her unless she'd given them the money.