what is the function of "lest" conjunction
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conjunction. for fear that; so that (one) should not (used negatively to introduce a clause expressive of an action or occurrence requiring caution): He kept his notes by his side lest faulty memory lead him astray. that (used after words expressing fear, danger, etc.): There was danger lest the plan become known.
Explanation:
The only auxiliary verb that can follow lest is should. Work hard lest you should fail. OR Work hard lest you fail.
it's Use- The only auxiliary verb that can follow lest is should. Work hard lest you should fail. OR Work hard lest you fail.