your father 是第三人称单数形式,所以用is .同样,主语classmates是第三人称复数形式,所以用are,用they.teens就是泛指那个年龄段
at 表示在刚好在那个点差不多的感觉,aged有一种,就是那种从头来算,她有40岁的感觉,就是一个是点,一个是面
具体的自己在体会一下把
懂英语的请进!1.How old is your father?he is 50.为什么不是用is而是用are?2.Ho
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