Matching Pairs KB15 Use of soOnline version Use of so. Kid's Box 4 Unit 5 Activity Book by Valeria Itzel Herrera Díaz 1 She couldn't find her phone so 2 He couldn't find his pen so 3 I couldn't find my camera so 4 He couldn't find his coat so 5 She couldn't find her glasses so 6 We couldn't find our books so we didn't do our homework. she couldn't read her book. he had to wear a jacket I couldn't take any photos. she couldn't talk to her friend. he had to write with a pencil