Analise as frases indicadas a seguir, de acordo com as regras gramaticais do uso dos verbos HAVE TO, DON’T HAVE TO, SHOULD e MUST.

I – I haven't to work on Friday.

II – You have to study a lot if you wish to pass your exam.

III – His doctor said he shouldn’t smoke anymore.

IV – I need to work on week days but I don’t have to work on weekends.

V – People as a whole should to start thinking about their own financial future.

De acordo com o uso dos verbos HAVE TO, DON’T HAVE TO, SHOULD e MUST, pode-se afirmar que