I have decided not to eat out more than twice a week.
Starbucks is a bit pricey, so I have made up my mind not to spend more than three thousand yen a month there.
ーI have decided not to eat out more than twice a week.
「外食は週に２回以上はしないと決めている」
I have decided to ...で「…と決めている」
I have decided not to ... で「…しないと決めている」
to eat out で「外食する」
twice a week で「週２回」
ーStarbucks is a bit pricey, so I have made up my mind not to spend more than three thousand yen a month there.
「スターバックスはちょっと高いので、月に3000円以上使わないよう決めている」
pricey で「値段が高い」
I have made up my mind to ... で「…するよう決めている」
I have made up my mind not to ... で「…しないよう決めている」
three thousand yen a month で「月に3000円」
ご参考まで！
カナダ 
