:complete the following sentences using past perfect. 1) boris explained that he (not to understand) rule number 3. 2) angela wanted to know of they (to be) there before. 3) olaf asked if we (to buy) tickets for the new play. 4) mother wondered if james (to pay) for the tickets to paris. 5) aunt grace said she (to visit) the bahrushin theatre museum in moskow. 6) she added that she (to spend) three hours there. 7)andrew told his brother he (to choose) a birthday present for their mother.

1) Boris explained that he had not understood rule number 3.
2) Angela wanted to know if they had been there before. 
3) Olaf asked if we had bought  tickets for the new play. 
4) Mother wondered if James had paid for the tickets to Paris. 
5) Aunt Grace said she had visited the Bahrushin Theatre Museum in Moscow.
6) She added that she had spent three hours there. 
7) Andrew told his brother he  had chosen a birthday present for their mother.