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Use "mothers-in-law" in a sentence
"“Maybe Solomon got depressed because he had hundreds of mothers-in-law?”"
"“Chief, how come I always used to forget the names of my mothers-in-law?”"
"Some plural compound nouns have an internal - s -, e.g. mothers-in-law, but if this was commonly initialised we would still say “em-eye-elz” rather than “emz-eye-el”."