Правило когда употреблчется should и must

Should можно перевести как "стоит". тебе стоит что то делать или не стоит. шуд всегда предполагает альтернативу. если человек говорит тебе you should go and visit doctorю он советует пойти к врачу, но выбор остается за тобой идти или нет. must   не оставляет нам выбора.   если шуд это как совет, то маст это что ты обязан сделать. you mustn't smoke in the classroom.

Iwould like to give a talk about collecting things. it is a very popular hobby for people all over the world, especially for children and grown-ups. the main reason why people collect  coins, stamps, books etc. is uniqueness of every collection. every subject has its own distinctive story, and it's tremendous. moreover, in the process of collecting people  apply skills in evaluating, classifying and arranging items.as for me, i have my own collection of minerals. they fill a  bulky closet in my room. some of  them i exchanged, some i bought and some are presents from my friends who know about my hobby. i do not want collecting something else - i am satisfied with my own unique collection.but people in my country do not collect minerals only. for example, my friend has a huge collection of coins. it is really valuable - he even has a coin minted in 1925! as far as i know, russian people also adore collecting weapon, posters, magazines, books and many other things.  all in all, collecting things is an exciting hobby for people of all ages. when people collect something, they improve patience and carefulness, find new friends who are collectors too.