I just have to go to university one day in the week.
I just have to go to university once a week.
I go swimming every monday, wednesday and friday.
I go swimming three times a week.
Ellen and I usually meet in the mornings and in the afternoons every day to talk.
Ellen and I usually meet twice a day to talk.
I only drive my car on tuesdays and thursdays.
I only drive my car twice a week.
I cook from monday to sunday.
I cook every day.
I only went to Miami five years ago, not in any other occasion.
I only went to Miami once.
I eat breakfast, lunch and dinner every day.
I eat three times a day.
We have classes from monday to friday.
We have classes five times a week.