You SHOULD learn it.

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We use SHOULD....

to criticise past decisions

"You should have sent an sms yesterday."

"You should have left earlier."

to give advice

"He shouldn't be late this time."

"You should speak with him about this problem."

"What should I do?"

to talk about probability

"It should be easy for you to make friends there."

"We should be there in about 20 minutes."

to give opinion/to say what you think

"You shouldn't worry so much for little things."

"Everybody should do some exercise regularly."