If need be + ...

Is this sentence natural?

If need be, take another dose. If yes then please convert this sentence into past and future tense.

Thank you.

Quote:

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Originally Posted by Jadoon 84

Is this sentence natural?

If need be, take another dose. If yes, then please convert this sentence into past and future tenses.

Thank you.

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There are two, apparently unrelated, sentences in your post.
Both are correct.