1 Choose the correct words to complete the sentences.
1 I've had my phone for / since six months. 2 She's had her computer for / since 2013. 3 They've lived there for / since last summer. 4 He's only played the guitar for / since three weeks. 5 I haven't seen my cousins for / since a long time. 6 We have known each other for / since we were ten years old.​