forty

grammar · medium

易错句子There are fourty students in my class.

正确表达There are forty students in my class.

拼写错误：forty 虽与 four 同源，但拼写时不保留 u，写作 forty；可对比 four→fourteen 保留 u，而 four→forty 不保留。同理 fifty、sixty 也不含 u。

grammar · medium

易错句子My uncle is in his forty.

正确表达My uncle is in his forties.

表示“四十多岁”这一年龄段时，英语用固定复数形式 in one's forties，不能像汉语那样直接说“他的四十”。因为这里指 40 到 49 岁之间的十年区间，需用复数。

grammar · medium

易错句子He is a forty-years-old man.

正确表达He is a forty-year-old man.

数词加名词构成的复合形容词作前置定语时，名词不用复数且各词间加连字符，故写 forty-year-old；只有在作表语时才说 He is forty years old，此时 year 用复数且不加连字符。