1.Wendy explained that she hadn't gone to the theatre
2.Boris explained that his cousin had arrived to London.
3.Mrs.Evans explained that they were fond of ballet.
4.Collin explained that he had been late to the performance.
5.Sid explained that his aunt had enjoyed her visit to Russia.
6.Tony explained that he hadn't known about that.
7.Florence explained that she had lost her favorite ring.
8.Valery explained that he hadn't felt well then.