Take light diet lest you____ fall ill. Which modal is required here? Please tell me

2 Answers

The modal verbs may or can are used to indicate possibility or probability.

Explanation:

Take a light diet lest you may fall ill.
Take a light diet lest you can fall ill.

The sentence is a bit unnatural for everyday English, which makes the choice of may the better choice.

A more relaxed or casual sentence would be:
Eat a light diet in case you fall ill.
Eat a light diet should you fall ill.

Mar 1, 2018

The modal verb required is should.

Explanation:

And this is the only modal which can follow lest.