Susan's parents ...... (ski) in the Alps for quite some time now.

The DA ...... (not / work) on any important cases recently.

Mr Willson ...... (not / keep) an eye on his nephew for years now.

The German economy ...... (support) other countries' economies ever since the EU crisis broke out.

The solicitor ...... (use) a crutch for over six months now.

My best friend ...... (limp) badly since he had a skiing accident last month.

Since when ...... (their cat / look) so sick?

Since when ...... (she / hunt) elephant?

Since when ...... (they / try) to find a job in the city?

How long ...... (we / cooperate) on that business of ours?

How long ...... (Jane's sister/ cook) for the shanty old restaurant?

How long ...... (you / steal) ideas from me?