The horse is a useful animal.在这句中,horse是指马这种动物,所以用单数.
Horses are useful animal.horses是复数,所以是用are.
the rich are not alway happy .富人并不总是高兴的.rich虽是个形容词,但在此,意思是富人.类似的还有old,poor等
The hourse is a useful animal.Horses are useful animal都是马是有用
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