Make the sentences negative. Use contractions.
They've received an email.
They haven't received an email.
1.I've been to Germany.I haven't been to Germany.2.We've sent the package.We haven't sent the package.3.He's read the message.He hasn't read the message.4.They've seen this movie.They haven't seen this movie.5.She's made a cake.She hasn't made a cake.6.We've passed the exam.We haven't passed the exam.7.My team has won the match.My team hasn't won the match.8.He's become a teacher.He hasn't become a teacher.9.She's lost her keys.She hasn't lost her keys.10.They've built the bridge.They haven't built the bridge.11.She's turned off the gas.She hasn't turned off the gas.12.We've bought a house.We haven't bought a house.13.He's gone to the seaside.He hasn't gone to the seaside.14.I've finished my essay.I haven't finished my essay.15.We've visited this museum.We haven't visited this museum.