Read and translate the joke. Mind the use of the Present Perfect Continuous Tense.

«I hear you have a little sister?» a gentleman asked a small
boy. «Yes», answered the boy. «Do you like her?» wondered
the gentleman. «I’d like to have a brother so that we could play
football and other games together», said the boy. «Then can’t
you exchange her for a boy?» the gentleman replied. «It’s too
late now. W e’ve been using her four days», sighed the boy.