See if this 'trick' helps you remember which word to use:
* You know that more than one of anything is plural.
* A plural usually ends in the letter 's'.
* If you group the third person singular pronouns together (he/she/it) your brain might think of the group as a 'plural' that requires an 's'.
* He/she/it comes...he/she/it goes. He comes. He goes. She comes. She goes. It comes. It goes.
Try it! If it still doesn't help, come back and we'll try something else!