在《及物动词不需要介词》一文中，谈到及物动词不需要通过介词引进宾语。但是，当及物动词有两个宾语时，有些无须介词，有些则需要。
两个宾路都无须介词的动词包括下列这些：
① Please show me the letter.
② Can you buy me a meal?
③ I will give you the latest newsletter.
④ John has sent Betty a cheque of $1000.
在①-④这样的句子里，有个直接宾语，也有个间接宾语。前者一定是“物”、后者一定是“人”。它们之间不需要介词作桥梁。另一些双宾语的动词，就需要介词的帮助了。关于这点，可以分四方面来谈。
Ⅰ。两个宾语可通过不同介词对换位置，如：
①a. The boss entrusted him with the job.
b. The boss entrusted the job to him.
②a. He tried to impress the new idea on us.
b. He tried to impress us with the new idea.
③a. A general should inspire his soldiers with great courage.
b. A general should inspire great courage in his soldiers.
Ⅱ。不同介词，不同意思，如：
④a. Who introduced John to you?
b. Who introduced John into the new office?
⑤a. We warned him of the hazard.
b. We warned him against the hazard.