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I wonder which one to choose here:

  • My father should drive carefully when it’s raining.
  • My father has to drive carefully when it’s raining.
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closed as not a real question by MετάEd, kiamlaluno, Kris, RegDwigнt May 14 '13 at 9:13

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

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Welcome to ELU. Two questions: 1. why is the title shouting at me? and 2. Where have you looked already, and why exactly are you still confused? (If you have this question because you are learning English, please consider asking it on English Language Learners instead of here.) –  Marthaª Mar 25 '13 at 18:31
    
@Marthaª For the first question why do you think so? for the second question I think I should choose "have to" but someone told that it is "should" because I should take into account the pronouns in this case –  user40268 Mar 25 '13 at 18:36
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1. All caps is considered shouting. 2. Please edit your question to include this information. Otherwise, it could be considered "general reference" and closed. –  Marthaª Mar 25 '13 at 18:42

1 Answer 1

Both are correct but they mean different things.

Both should and have to (provided have to is pronounced with an /f/) are modal verbs.
Should is a full fledged modal auxiliary verb, and have to is a periphrastic modal construction.

Have to is the paraphrase for must, another modal auxiliary verb.
It is not a paraphrase for should, which refers to a weaker variety of necessity or obligation:

  • He has to go = He must go = He is obliged to go.

The usual periphrastic constructions for should are supposed to (pronounced /spostə/)
and ought to, but not have to.

  • He ought to go = He's supposed to go = He should go = He is well-advised to go.

In the sentences offered,

  1. My father should drive carefully when it’s raining.
  2. My father has to drive carefully when it’s raining.

(1) means that my father really ought to drive carefully under those circumstances
(for whatever reason,though no reason or outside authority is invoked or implied)

(2) means that driving in the rain is difficult for him and forces him to drive carefully.

In (1), my father is responsible for his driving and may or may not comply.
In (2), the only way he can drive at all is by driving slowly.

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