1 .Which of the pairs of sentences below are similar in meaning and which are different?

1 'Do you want to buy that CD, John?' asked Marian. Marian asked John if he had bought that CD.
2 My friend says that it's necessary to get to the concert by 7 p.m. My friend says that we don't have to get to the concert by 7 p.m.
3 I started playing the guitar five years ago and I still play it now. I played the guitar for five years.
4 Their second album is better than their first one. Their first album isn't as good as their second one.
5 Someone stole my CD player while I was sitting on the bus. My CD player was stolen while I was sitting on the bus.
6 I left the house early so that I wouldn't be late. I left the house early in order not to be late.
7 'Are you coming to the party?' Sally asked Mel. Sally asked Mel if she was coming to the party.
8 When I was a child, I played the violin every day. When I was a child, I used to play the violin every day. ​