MODAL VERBS: SHOULD AND MUST

SHOULD 

Recommend the modal verb "should" to give a courteous advice or recommendation. 

• "I have a terrible stomachache." "You should go to the doctor's."
• "I haven’t heard from my father." "You should call him."
• "She's not happy with the salary offered." "She shouldn't accept the job."

 Forma

Se usa "should" / "shouldn't" + el infinitivo del verbo principal (sin "to")

Ejemplo

I You He, She, It We They	should	do	more exercise.
		get	a new car.
	shouldn't (should not)	smoke.
		spend	so much money.

Should	I you he / she / it we they	get	more qualifications?
		wear	something different?

• 

Must

"Must" is also used to speak of obligation and is used in written rules and instructions: -You must submit your proposal by noon on July 12.

-You should not use a calculator during the exam.

"Must" is also used to make a firm recommendation:

-You must tell him before it is too late.

-You should not be late for work on your first day. Negative 

"must" o "mustn't" ("must not") + el infinitivo del verbo (sin "to")
Example  

I You He / She / It We They	must mustn't	report	the theft to the police immediately.
		forget	to transfer the money.

Must

I you he / she / it we they

go?

EXAMPLE