They say his father works in this factory
must ты используешь как приказ, то есть ты ДОЛЖЕН сделать... should ты используешь как : ты можешь делать и можешь не делать. Отрицательная форма mustn't , shouldn't.
What did you do last weekend?
I did my homework first and then I went to the movies with my parents
what did you do in the morning?
I had breakfast in the morning
2.has been put up
3.has been painted
4.has been installed
5.has been delivered
6.has been bought
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Глагол are- настоящее время
c) Present Simple</span>