複數
the old/young/rich/poor/blind/deaf 都是一類人，是複數，謂語動詞用複數（are/ do)
1、the + adj.： 英語中，“the + 形容詞”結構用來表示一類人，是複數。
如: the young， the educated， the middle-aged， the wise …
The old are well looked after in this old house.
The wounded are being tended in the hospital.
注：表示類別的還可用：a / an + 名詞單數(屬於單數)the + 名詞單數(屬於單數)
名詞的複數(是複數)
如: A horse is a useful animal.
Students are persons who study at school.
The telephone was invented by a man called Bell.
注：表示發明物，用：the + 名詞(單數
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