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"Please let me know what time works best for you." vs "Please let me know when would it be most suitable for you."

Neither is correct. See below for correct alternatives to these phrases.

Last Updated: January 19, 2017

Please let me know what time works best for you.

This is not correct. Don't use this phrase.

It is better to use the word which here.

ExpertExplanation provided by a TextRanch English expert

Preferred Form:
Please let me know which time would be best for you.

Please let me know when would it be most suitable for you.

This is not correct. Don't use this phrase.

This is an awkward-sounding sentence that native English speakers would not use.

ExpertExplanation provided by a TextRanch English expert

Preferred Form:
Please let me know which time would be best for you.

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