I can’t look up the new words because I don’t have a dictionary.
If I
The scientists are studying the problem carefully.
The problem
We can’t look up the new words because we don’t have a dictionary.
If we
They have not seen such a beautiful picture before.
This is the first time they
If you don’t study hard, you will fail in the exams.
Unless you
Unless you go out, I will call the police.
If you
Unless I have a quiet room, I will not be able to do any work.
If I
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