例句：
1、Our son's having problems with his reading and writing.
我們兒子在讀寫方面有困難。
2、I've never been a great one for writing letters.
我向來不喜歡寫信。
3、She hasn't written ─ not that she said she would.
她還沒寫信來——倒不是她說過她要寫。
4、This expression is used mainly in speech, not in writing.
這種表達(dá)主要用于口語，而不是書面語。