1. have to

 HAVE TO

We use HAVE TO  to talk about obligations.

Why is very important to apply this verb in my life?

Juan Manuel says 2BT.V.: 

´cause I´ll be very lazy.

I, WE,YOU,THEY  + HAVE TO + VERB IN ITS BASE FORM

SHE, HE, IT HAS TO + VERB IN ITS BASE FORM