Which form of should not do you use?

Question

Is it no debería or no deben I'm trying to say shops should not be fined for putting up christmas decorations but confused on my tenses

Answer 1

I am not native but I would say "no deberían" for should not and "no deben" for must not.

Let's see what the natives say.

Well, we can be two non-natives that are incorrect. - 0074b507, Dec 1, 2011

Answer 2

Half and half je je

I would use - no deberían - the conditional but because it's 'the shops' plural you will need the use deberíaN in the third person plural.

As far as I understand it:

deber (present tense) + infinitive is used to express a supposition, something that is probable (must be) or obligation (must do something)

Maria debe de haber llagodo.

Mary must have arrived.

but debería is used to make a suggestion (ought to/should) or suggest moral obligation.

Shops are the object being fined. The person of shouldn't depends on the subject imposing the fine unless we use the impersonal or passive voice. - 0074b507, Dec 1, 2011

Answer 3

no debe= mustn't, not have to

no debería= shouldn't

no debiera in subjunctive mood