Hello, I am Yoshi from NILS Japanese language school. Let’s finish Lesson 11 today.
[Quantifier (period)に　-回　V]
With this expression you can say how often you do something.
(Example)
1ヶ月に　2回　映画を　見ます。　　I go to see movies twice a month.

[Quantifierだけ／Nだけ]
だけ means “only.” It is added after quatifiers or nouns to express that there is no more or nothing (no one) else.
(Example)
この事務所に　外国人の　社員（しゃいん）が　1人だけ　います。
There is only one foreign employee in this office.
休（やす）みは　日曜日だけです。　　I only have Sundays off.
*社員：　employee
*休み：　holiday, day off

August 10th News, from NILS Japanese language school.