AUXILIARY VERBS

THE AUXILIARY VERBS MUST,SHOULD AND HAVE TO MODIFY THE MEANING OF A MAIN VERB EXPRESSING ABILITY AUTHORITY FORMALITY POLITENESS OR DIFFERENT CERTAINTY DEGREES

• YOU SHOULD TAKE SOMETHING FOR YOUR HEADACHE

Los verbos auxiliares debe, y debería tener que modificar el significado de un verbo que expresa la capacidad autoridad formalidad cortesía o diferentes grados

• Usted debe tener algo para tu dolor de cabeza

Should It is used to giving advice.

It indicates that something is good and therefore should be done.

It is a recommendation, not an obligation. It has less force tax "must" and that "have to". If you feel bad you should go to the doctor It is also used to give an order but a very educated. Anyone

who wants to enter the conference should show his credentials (This is really an obligation-is required to show credentials to enter the conference, but is expressed so little coercive) Construction: this modal verb is followed by the infinitive of the verb main without the particle "to". It is used in the past, present and future.

I should have finished my report yesterday (past) You should help me, I can not do it alone (this) Tomorrow you should call your parents (future) The past is used to denote something that should have been done and not done. The negative is: should You should not smoke And how interrogative:

Should + subject ...? Should I wear a dark suit for the party?

Must / Have to They express an obligation, something needs to be done.

You must come here immediately (an order) If you want to make a career in a company you have to speak English (There is no alternative: either speak English or no career possible) Check the difference with the following sentence: Nowdays it is very important to speak English.

You should do it. Here is a council, while in the preceding was an obligation.

Moreover, when used "must" / "have to" the issuer is convinced that the obligation will be fulfilled, whereas when using "should" do not know if the council is going to continue or not. We should buy a new car (a desire, there is no assurance that we will do) We must buy a new car (there are many chances that we do)

Traducion

Should

Se utiliza para dar consejos. Se indica que algo es bueno y por lo tanto se debería hacer. Es una recomendación, no una obligación.

Tiene menos fuerza impositiva que "must" y que "have to".
If you feel bad you should go to the doctor

También se utiliza para dar una orden pero de forma muy educada.
Anyone who wants to enter the conference should show his credentials
(Se trata realmente de una obligación -es obligatorio mostrar las credenciales para entrar en la conferencia-, pero está expresada de forma poco coercitiva)
Construcción: este verbo modal va seguido del infinitivo del verbo principal sin la partícula "to".
Se utiliza en pasado, presente y futuro.
I should have finished my report yesterday (pasado)
You should help me, I can not do it alone (presente)
Tomorrow you should call your parents (futuro)
El pasado se utiliza para indicar algo que se debería haber hecho y no se hizo.
La forma negativa es: shouldn't
You shouldn't smoke
Y la forma interrogativa: Should + sujeto...?
Should I wear a dark suit for the party?
Must / Have to
Expresan una obligación, algo que hay que hacer.
You must come here immediately (es una orden)
If you want to make a career in a company you have to speak English (No hay alternativa: o hablas inglés o no hay carrera posible)
Comprueba la diferencia con la siguiente oración:
Nowdays it is very important to speak English. You should do it.
Aquí se trata de un consejo, mientras que en la anterior era una obligación.
Por otra parte, cuando se utiliza "must" / "have to" el emisor tiene la convicción de que la obligación va a ser cumplida, mientras que cuando se utiliza "should" no se sabe si el consejo se va a seguir o no.
We should buy a new car (es un deseo; no hay seguridad de que vayamos a hacerlo)
We must buy a new car (hay muchas probabilidades de que lo hagamos)