Bevestigend
I have worked at NSG since September.
Ontkennend - Have/has + not + ww-ed/3e rij
Ik heb niet gewerkt op het NSG sinds September.
I have not worked at NSG since September.
Vraagzin - Persoon <-> have/has + ww-ed/3e rij
Have you worked at NSG since September?