Lest
The conjunction lest is not very common in modern English. This word has a negative meaning. Therefore, it should not be used with not. The only auxiliary verb that can follow lest is should.
- Work hard lest you should fail. OR Work hard lest you fail. (NOT Work hard lest you should not fail.)
The same idea can be expressed using the expression or else.
- Work hard, or else you will fail.
- Leave on time, or else you will miss the train.
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