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Michael is still staring intensely at his laptop.

Under the desk, his feet tapping (the floor) impatiently, showing his growing frustration.


How would you write the bold-face part? Is 'the floor' necessary? And if so, would I need to add a preposition before it?

Could tripping be used instead of tapping in this context?

Thanks.

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anonymousUnder the desk, his feet tap ping ( the floor ) impatiently, showing his growing frustration.
anonymousIs 'the floor' necessary?

I would include it.

anonymousAnd if so, would I need to add a preposition before it?

You could use "on", but it is not necessary.

anonymousCould "tripping" be used instead of "tapping" in this context?

No. That has a different meaning.