Unless vs If not: What's the Difference?
What's the Difference?
Unless is used in most cases with the same meaning as 'if ... not'.
Memory Tip: unless = one word, if not = two words
unless
conjunction"Unless" is used to say that something will happen only if another thing does not happen.
Example:
I'll join you for the movie unless I have to work late.
Common patterns:
unless you
unless it rains
unless I forget
if not
Example:
We should leave now if not, we might miss the train.
Common Mistakes
I won't go to the party if you don't come with me.
I won't go to the party unless you come with me.
Unless is used to indicate the condition under which the action will not occur.
I'll call you unless I hear from you first.
I'll call you if I don't hear from you first.
If not is used to specify the condition under which the action will occur.
Quick Practice
0/2 correct1. I'll join you for the movie ____ I have to work late.
2. We should leave now ____, we might miss the train.
Other Confusing Words
Never confuse unless / if not again
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