posted by John .
1. They work on Saturday mornings.
2. They work in the mornings.
Is the use of plural nouns, mornings, in the sentences above grammatical?
English Grammar -
In (1) it is OK to use the plural "mornings" to distinguish the situation from working on one or a few Saturday mornings only.
In (2), use of the plural is ungrammatical and not advised. It would imply that they work every morning, with no holidays, weekends or vacations.