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watch用作名词,意思是“手表”时是一个可数名词,这时watch的复数形式是watches。可数名词变复数规则以ch结尾的可数名词,一般在后面加es。
以s,x,sh,ch结尾的名词,及以o结尾的有生命名词,复数形式都是加es。所以watch复数加es,即watches;如果作为动词“观看”,三单形式也是加es,即watches.

watch的复数简单句举例

ls this her watch?(变为复数)
are these her watches?
That is her watch.(变为复数)
Those are her watches.