dictionary複數加s還是es

複數是把y變爲i，加es，複數形式是dictionaries，例如：

1、English textbooks and dictionaries are on sale everywhere英語教材和詞典到處都有賣的。

2、Dictionaries are indispensable in English study.學英語，詞典是少不得的。

3、There are a lot of dictionaries in the reading room. You will find them very handy if you go there to study.閱覽室詞典多，在那兒學習很方便。