To express period and frequency—in other words, to say how many times something happened per day, week, and year, and so on—we need the a counter with the target particle. See here for an introduction to counters in Japanese.


This structure is most often used with the counter かい, which means “times” (e.g. I go back to my hometown 3 times per year”).

Five times per week.
To return to your hometown twice per year.
To read 3 books per week.

Note the position of the object particle—before the counter.

In fact, the target particle is often omitted.

To go to the gym four times per week.
To go abroad twice per year.
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