a: Two couples are walking (a pair of couples is very odd) b: One sneezes into a handkerchief (also known as a 'hankie" in US) c: "crowd" is usually singular [use is ] d: This sentence is fine.
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Vincent TeoThanks, but what does it mean "couple"? That mean a person? ot two persons?A couple refers to two people.
If I say,
(a) A couple are walking on the beach.
Do you think it is correct?