I can let you have the dictory at half it price

应改为：I can let you have the dictionary at half of ?its price.

在这个句子中I can let you have the dictionary at half of ?its price.

有如下三个知识点：

一：can为情态动词， 能，会，+动词原形，过去式为could,

其他情态动词还有may\must\might+动词原形

二、let you have the dictionary.

let sb. do sth使，让。。。同意的还有：

make sb. do sth.?

have sb. do sth.

三、 at half of its price以一半的价格

at the price of 以。。。的价格。

例如：

1、 He may make me have this book at one third of its price.

2、They must get these things at lower price.

他们必须以很更低的价格购买这些东西。