dictionary的复数形式是dictionaries，它的复数形式变化遵循规则：可数名词变复数以辅音字母加y结尾，变y为i加es，story其中r是辅音字母，要变y为i加es。（元音字母加y结尾直接加s  a，e，i ，o，u是元音字母）。

dictionary的复数形式使用例句

Is it his dictionary? （变复数）
Are these his dictionaries? 

It is your dictionary. （变复数）
They are your dictionaries. 

I like to have my dictionaries within my easy reach. 
我喜欢把字典放在顺手的地方。

There are a few dictionaries on his desk. 
他的案头放着几本字典。

Many dictionaries are piled up on the desk. 
桌上堆集着许多本字典。

The two dictionaries can be used alternately. 
两本字典可以交互使用。

English textbooks and dictionaries are on sale everywhere. 
英语教材和词典到处都有卖的。

I have some English dictionaries. 
我有一些英语词典。

He looked up the word in several dictionaries. 
他在几本字典中查了这个单词。

The publishing house has published five dictionaries. 
这家出版社已出版了五部字典。