Can you please check if these sentences are correct? Thank you very much.
1) How long does your English lesson (class) last?
2) The Druids formed the intellectual class in Celtic society.
2) To become Druids, students were instructed and trained in large groups for a period of up to twenty years.
3) They were supposed to be able to predict the future, control the weather and shape-change themselves into the forms of animals.
4) The oak and the mistletoe were the most important sacred trees (?)to the Druids. As a matter of fact, they used their foliage to perfom many religious rites.
5)Many Druids were women. They enjoyed more freedom and rights than women in any other contemporary culture.
6) In particular, they were entitled to enter battle and divorce their husbands.
7)Uther sent for Merlin the magician because he feared there might be a plot to kill his son.