3. make the statements negative. a. they've sold their house. b. we've been waiting for a long time. c. she's revising for her exams. d. when she phoned, i was having a shower e. she needs a computer for her job. f. the telephone was invented in the 20th century. g. i'd already packed my suitcase when he came home. h. it's an interesting book. i. my mother bought presents for everyone. j. i'll be watching tv