How long has your sister been learning Chinese?
She has been learning Chinese since 2011
3 How long have Jess and Emma been working at this cafe?
They have been working at this cafe for 3 months
4 How long have we been standing on this platform?
We have been standing on this platform for 40 minutes
12
2 haven't been studying 3 has been teaching 4 have been coming 5 have been watching