5 The boy was lying on the bed, fast asleep. (Lie - лежать, непереходный глагол; lay - уложить, покрывать и т. д. - это переходный глагол, требует дополнения)
6 She understood her mistake and blushed with embarrassment.
7 Where should I put all this furniture? (неисчисл. сущ.)
8 She is the girl who saw the murder.
9 We must hurry; we have no time to lose.
10 When you come back, I'll tell you all about it. (придаточное времени)