Distributive plural: Tell them to bring raincoats.
People doing the same thing
To talk about several people each doing the same thing, English usually prefers a plural noun for the repeated idea.
- Tell the kids to bring raincoats to school tomorrow. (More natural than Tell the kids to bring a raincoat …)
Plural forms are almost always used in this case if there are possessives.
- Tell the children to blow their noses. (not
… to blow their nose.) - Six people lost their lives in the accident.
Uncountable nouns cannot of course be used in the plural.
- They were all anxious to increase their knowledge. (not
… their knowledges.)
Repeated events
In descriptions of repeated single events, singular and plural nouns are both possible. When no details are given, plural nouns are more natural.
- I often get headaches. (More natural than I often get a headache.)
- She sometimes goes for rides over the hills.
When details of the time or situation are given, nouns are often singular.
- I often get a headache when I’ve been working on the computer.
- She often goes for a ride over the hills before supper.
Singular nouns may also be used to avoid misunderstanding.
- I sometimes throw a stone into the river and wish for good luck. (clearer than I sometimes throw stones … – only one stone is thrown each time)
To refer to the time of repeated events, both singular and plural expressions are often possible with little difference of meaning.
- We usually go and see my mother on Saturday(s).
- He’s not at his best in the morning(s).
Generalisations and rules
In generalisations and rules, singular and plural nouns are both possible.
- We use a past participle in a perfect verb form. (or We use past participles in perfect verb forms.)
- All documents must be accompanied by a translation of the original. (or All documents must be accompanied by translations of the originals.)
Mixtures of singular and plural are possible.
- Subjects agree with their verb.
- Children may resemble both their father and their mother in different ways.
This often happens with fixed singular expressions like at the beginning.
- Discourse markers often come at the beginning of sentences.