3 . They say that… = It is said that … 据说
…and they say that there are ten sheep for every person . 据说每人占有十头羊。
句中的 they 并没有具体的对象，泛指人们 ( people ) 。
They say that… = People say that… = It is said that… 如：
It is said that he will leave in a few days . 据说他过几天就要动身。
4 . How often do you write ? 你们隔多久通一次信 ?
( 1 ) How often 常用来询问动作的频率，回答可用：some times／very often／not too often／once／twice／three times a year…有时／经常／一年一次 ( 二次／三次 ) 等。例如：
—How often do you go to see your grandmother in the countryside ? 你多久去看一次住在农村的祖母 ?
—Twice a year . 一年去两次。
( 2 ) 注意下面以 how 提问的句子的准确含意。
—How long have you waited here ?
— For about two hours .
how long 表示动作或状态“延续的时间”。
—How much time did you spend on this work ?
— Just a week .
how much time 表示一个“总的时间量”。
5 . …because neither of us has much time . ……因为我们俩没有太多的时间。
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