83375
I have already learned about に time particle (in short: determines the action
time if the time expression isn't relative). But I saw some text where dropped
when used the まいとし, まいつき、まいにち etc.

For example:

> まいにち おちゃ を のんでいます。- I'm drinking tea every day.

Is this correct? Or should I use with the particle?:

> まいにち **に** おちゃ を のんでいます。- I'm drinking tea every day.

If the two sentence is correct then is the difference: the last sentence is
more formal than first?
CC BY-SA 4.0
2020-12-29T16:00:36.180
83338
2020-12-31T04:38:50.430
40425
question
particle-に て-form time formality
Is the に time particle optional when talk about repeated action?
Simply, まいとし, まいつき, まいにち and so on never take に. You have to remember which
word needs に and which word works on its own as an adverb. (In English, "every
month" and so on don't need "in" or "on", so this should not be surprising.)
CC BY-SA 4.0
2020-12-31T04:38:50.430
83375
2020-12-31T04:38:50.430
5010
83338
answer