For some verbs, the letter (o) changes to (ue) in the present tense (with the exception of nosotros and vosotros). These verbs are known as "o to ue stem-changing verbs".

One of these verbs is volar (to fly). The congugation of the verb volar is shown below:

volar (example sentences) (full conjugation)

			

				
 
				
volar
				
 
			
			

				
yo
				
 vuelo
				
(I fly)
			
			

				
tú
				
 vuelas
				
(you fly)
			
			

				
Ud/él/ella
				
 vuela
				
(you/he/she flies)
			
			

				
nosotros (as)
				
 volamos
				
(we fly)
			
			

				
vosotros (as)
				
 voláis
				
(you fly)
			
			

				
Uds/ellos/ellas
				
 vuelan
				
(you all/they fly)
			
		

Let's look at some example sentences:

Yo vuelo a México. - I fly to Mexico.
Tú vuelas en avión. - You fly by plane.
Las aves vuelan al sur. - The birds fly south.

The verb poder (to be able) is also a stem-changing verb. See the examples below:

¿Puedo tomarlos juntos? - Can I take them together?
Tengo sed. ¿En dónde puedo encontrar agua?
I'm thirsty. Where can I find water?
Puedes pintar en la clase de Arte.
You can paint in Art class.
Por ahora, Pablo y Teresa no pueden cenar con ellas.
For now, Pablo and Teresa can't have dinner with them.

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