10. I haven’t met my aunt since I was 10 years old.
= I last met my aunt when I was 10 years old

11. This is the first time she has worked with foreigners.
= She hasn’t worked with foreigners before
12. She started to cry two hours ago.
= She has cried for two hours
13. We started to chat on the phone when it began to rain.
= We have chatted on the phone since it began to rain
14. We got to know each other when we were at university.
= We have known each other since we were at university
15. The last time she phoned her parents was 3 weeks ago.
= She hasn’t phoned her parents for 3 weeks
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