第四句型：主语 + 及物动词 + 双宾语
有些动词(主要是"授予动词")后面需要或可以接双宾语结构，如：give, write, buy, send, make等
You may send him an E-mail or write him a letter.
这个句子也可使用以下结构：
You may send an E-mail (to him) or write a letter to him. 所以 "to" 和 "for" 是连接双宾语结构的重要介词。
该句型的重点是要记住以下短语，特别是所用的介词：
to cure … of(治愈…)
to accuse …of(谴责…)
to convince… of(说服…)
to inform… of(通知…)
to notify… of (通知…)
to clean… of (清除…)
to warn…… of / against (警告…)
to cheat… of(欺骗)
to rob… of(抢劫…)
例如：
We have to inform the family of the patient's condition as soon as possible. / Have the family been informed of the patient's condition? (我们得尽快将病人的病情通知其家属。/ 已经将病人的病情通知其家人了吗?)
注意下面句子的结构变化：
May I ask you a question? → May I ask a question of you?
直接和间接宾语的位置与上面短语有何不同?