If the infinitive(to+verb) ends with
-sh or
-ch, the he,she and it form ends with
-es. The same goes for the verb
to go.He washes his clothes everyday.
She catches the ball with her hands.
It goes wrong.
If the infinitive ends with -y, the he, she and it form doesn't have the -y and ends with -ies
The plane flies to London.