Spanish has a large number of irregular verbs. Luckily, most of them can be categorized in groups which are irregular in the same way. In this lesson you will learn a group of verbs that changes the first person ending -o into -go in the present tense.

Common verbs which do this are hacer, salir, valer and poner. If another verb ends in one of these verbs, for example suponer, you can be almost certain that it will conjugate in the same way.

to do, to make	hacer
to leave, to go out	salir
to be worth, to cost	valer
to put	poner

-o → -go	Singular	Plural
First person	hago salgo valgo pongo	hacemos salimos valemos ponemos
Second person	haces sales vales pones	hacéis salís valéis ponéis
Third person	hace sale vale pone	hacen salen valen ponen

Note that hacer is an exception here, since we don't only add a g, but also drop the c to make hago.