To make ます into the volitional form, replace the す ending with しょう.1

Example

γŸγΉγΎγ™ (eat (polite)) β†’ γŸγΉγΎγ—γ‚‡γ† (lets eat (polite))

Info

ます is transformed by removing the す ending. しょう is then added to make it into the volitional form.

Footnotes

  1. Japanese from Scratch (7.5) ↩