Spanish grammar Lesson 30. The
obligation in Spanish. 1) Have that + infinitive. This
expression refers to “someone has to do something. “Have is conjugate according to
theme of the sentence. Examples: I have to do homework.
Miguel has to clean the house. 2) Duty + infinitive. This expression
can be translated as “someone should do something. “Duty is a regular verb and
it is also conjugated according to the subject of the sentence. I have to talk to Dolores. You must study
more often. 3) “You have to” + infinitive. This expression denotes the idea that “one must do something “and” you need to do something. “It’s an impersonal expression so always the verbal form “there is” is used. Take a look at the following
examples: you have to practice Spanish. You have to clean the window, it’s dirty. The discordant uses of these three
structures. Take a look at the examples below that highlight the
difference between the three expressions: Antonio travels to France tomorrow. He has to / must learn French. French is a complicated language. You have to study a lot.