"हम एक सैंडविच खाते हैं।"
अनुवाद:We eat a sandwich.
Whenever you are talking about 'third person singular' like he, she, it... add "s" at the end of the verb otherwise use the verb itself.
Ex. Third person singular... John reads an article. He eats an apple. She goes for jogging. It runs fast.
Other... They run fast. I drink juice in the morning.