In english, the plural is often formed by adding "s" to the singular form.
Examples:

But there are cases where we add more than "s", for example:
         For the words ending by Consonant+y, we substitute Y by IES.

         For the words ending by X, CH or SH, we add ES.

         For the words ending by F or FE, we substitute F/FE by VES.

         For the words ending by Consonant+O, we add ES.

In addition to these forms of plural, there are irregular forms:

To test your knowledge about this lesson, do this test: Test of Passive voice

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