Answer:
Quiero comer papas.
Él sabe poner la mesa.
Explanation:
If you are going to use -ER verbs, these are infinitive verbs. You use infinitive verbs to talk about actions.
Be careful with your question directions. Maybe you would need to write two sentences conjugating -ER verbs. For example "Yo como papas" and "Él pone la mesa". In these two sentences, I had conjugated the verbs Comer and Poner.
