Good morning, Brainer. Still on the 'should' section I see! These sentences are examples of subjunctive-style constructions. In most cases the subjunctive form is identical to the present simple, so our much over-used modal verb 'should' is pressed into service to indicate the uncertainty of the situation. Once again, the modal serves to distance the speaker, and to show that this is a desirable, but still hypothetical situation. I presume that in Portuguese you would use a subjunctive here? British English in particular tends to avoid the subjunctive, and express the concept using 'should'. The form is both common and correct.

The first sentence does not sound correct