5.121 prepositional phrases

Prepositional phrases with plural forms of specific time words can also be used to indicate frequency. For example, 'on' can be used with days of the week, 'during' and 'at' with 'weekends'.

• We've had teaching practice on Tuesdays and lectures on Thursdays.
• She does not need help with the children during week-ends.
• We see each other at week-ends.

'In' is used with periods of the day, except 'night'.

• I can't work full time. I only work in the afternoons, I have lectures in the mornings.
• Harry Truman loved to sit in an old rocker in the evenings and face the lawns behind the White House.