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Should' is a modal verb used to politely express obligations or duties, to ask for or issue advice, suggestions, and recommendations, to describe an expectation and to express surprise."
'Should' is used to create a polite form that is more like a guideline than a rule.
It is used in :
Simple present tense (should)
Present continuous tense (should be)
"Auxiliary-cum-verbs" are :
These 11 auxiliaries are also used as verbs, therefore, they are called Auxiliary–cum–verbs.
These are used to form Tenses. ( Please refer Tense Table).
"Pure Auxiliary verbs" are :
These 20 auxiliaries only support normal verbs, therefore, they are called Pure Auxiliary Verbs. They are also called Models or Model Auxiliary Verbs.