-ar
-er
-ir
stem changing
random
100

to finish, to end 

acabar, terminar

100

to turn on

prender 

100

to open 

abrir

100

to close 

cerrar (i-ie)

100

to happen

suceder, pasar

200

to love 

amar

200

to learn

aprender

200

to raise, go up, increase

subir

200

to remember, to remind 

acordarse (o-ue)

200

to try

intentar, tratar de

300

to turn off

apagar

300

to believe

creer

300

to build 

constuir 

300

to remember 

recordar (o-ue)

300

to laugh

recoger (yo recojo)

400

to help

ayudar

400

should to owe

deber

400

to decide

decidir

400

to understand

comprender, entender (e-ie)

400

to smile

sonreir (yo sonrio)

500

to look for

buscar

500

to provide

proveer

500

to allow

premitir

500

to count to tell

contar (o-ue)

500

to answer 

responder, contestar