Nr 1. voor activiteiten die in het verleden zijn en nog steeds bezig zijn.
Present perfect = zonder nadruk - have/has + ww
vb: I, you, we, they have left the office - He/she/it has left the office
present perfect continuous = met nadruk - have/has + been + ww + ing
vb: I, you, we, they have been working here since 2014
vb: He/she/it has been working here since 2014