The document discusses the differences between the modal verbs "should" and "must". Should expresses advisability or suggestion and is weaker than must. Must expresses certainty or necessity and is stronger than should. Both can be used in positive, negative, and interrogative forms with a noun/pronoun plus the modal verb plus a verb and complement. However, should is used to give advice or recommendations, while must is used to express a stronger point of view or opinion about necessity.
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Should
3. SHOULD
ï‚¡ Is most commonly used to make recommendations or give advice.
ï‚¡ It can also be used to express obligation as well as expectation.
4. SHOULD STRUCTURE
POSITIVE FORM
ï‚¡ NOUN/PRONOUN + SHOULD+ VERB+ COMPLEMENT
ï‚¡ You should eat more slowly.
NEGATIVE FORM
ï‚¡ NOUN/PRONOUN + SHOULD+ NOT+ VERB+ COMPLEMENT
ï‚¡ You shouldn't work so much.
INTERROGATIVE FORM:
SHOULD+ PRONOUN/NOUN+VERB+ COMPLEMENT+?
Should you eat more slowly?
6. MUST
ï‚¡ Is most commonly used to express certainty.
ï‚¡ It can also be used to express necessity or strong recommendation.
7. MUST STRUCTURE
POSITIVE FORM
ï‚¡ NOUN/PRONOUN + MUST + VERB+ COMPLEMENT
ï‚¡ You must eat more healthy.
NEGATIVE FORM
ï‚¡ NOUN/PRONOUN + MUST+ NOT+ VERB+ COMPLEMENT
ï‚¡ You must not work so much.
INTERROGATIVE FORM:
MUST+ PRONOUN/NOUN+VERB+ COMPLEMENT+?
Must you take the medicines?
•Must I help in the garden?
9. DIFFERENCES BETWEEN SHOULD & MUST
SHOULD
ï‚¡ Should expresses advisability, a suggestion.
ï‚¡ It is weaker than must.
MUST
ï‚¡ We use must to express a stronger point of view.
ï‚¡ Also expresses opinion, one person's point of
view.
10. SHOULD
SHOULD PLAIN FORM VERB
People should protect the environment. It makes
good sense.
We should select cars so that they are more
fuel-efficient.
We should use re-usable bags when
shopping.
MUST
MUST PLAIN FORM VERB
We must protect our environment, or our
resources will disappear.
Engineers must redesign engines so that they are
more fuel-efficient.
Stores must give out recyclable plastic bags.