You shouldn't smoke so many cigarettes. =>Tu ne devrais pas fumer autant de cigarettes.
I should work harder if I want to succeed. =>Il faudrait que je travaille plus dur si je veux réussir.
He shouldn't waste his money at the casino. => Il ne devrait pas gaspiller (to waste) ses sous au casino.
She should wear a dress instead of jeans. => Elle devrait porter (to wear) une robe plutôt que des jeans.
They should drive more carefully! => Il faudrait qu'ils conduisent plus prudemment !
They shouldn't say such stupid things! => Ils ne devraient pas dire (say) de telles stupidités!
SHOULD + infinitif sans to sert essentiellement à donner des conseils.
EXERCICES
En ligne
https://test-english.com/grammar-points/a2/should-shouldnt/
https://elt.oup.com/student/solutions/elementary/grammar/grammar_05_022e?cc=fr&selLanguage=en
https://www.esl-lounge.com/student/grammar/2g18-should-shouldnt-exercise.php
https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-15134.php
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