the workshop cover vs the workshop covers

Some examples from the web:

• Which areas of expertise and sectors did the above-mentioned workshop equipment cover?
• Which areas of expertise and sectors did the above-mentioned workshop equipment cover? (c)
• There's an underground storage area in the workshop that has a drain cover that joins up with the sewers.
• The EU contribution will cover the participation of representatives from beneficiary States and experts in the workshops, excluding UN staff, as well as conference costs.
• Isabella sent me downstairs to the workshop.
• The invitations to the workshops will specify that the workshops are part of an EU initiative.
• The workshop focussed on transparency in conventional arms transfers, confidence building measures and practical exercise sessions.
• The Czech Republic participated and presented its technical expertise and experience at the workshop.
• Consensus was also reached on maintaining the workshops in their current form.
• He was manager of one of the workshops in 420.
• We'll get to the other end of the workshop through these pipes.
• No, Lowry was in one of the workshops.
• I've found Hammond's spare pontoons from the workshop over there.
• - Let's have a look at the workshop.
• Then somebody picks up a scrap of newspaper in the workshops...
• He came into the workshop, started up his van and he drove away.
• There was some bloke who came in to the workshop.
• Shortly after the murder, somebody drove Ruairi's van away from the workshop.
• The bodies are in the workshop.
• In a little room, out by the workshop.

Some examples from the web:

• Which areas of expertise and sectors did the above-mentioned workshop equipment cover?
• Which areas of expertise and sectors did the above-mentioned workshop equipment cover? (c)
• There's an underground storage area in the workshop that has a drain cover that joins up with the sewers.
• The EU contribution will cover the participation of representatives from beneficiary States and experts in the workshops, excluding UN staff, as well as conference costs.
• Isabella sent me downstairs to the workshop.
• The invitations to the workshops will specify that the workshops are part of an EU initiative.
• The workshop focussed on transparency in conventional arms transfers, confidence building measures and practical exercise sessions.
• The Czech Republic participated and presented its technical expertise and experience at the workshop.
• Consensus was also reached on maintaining the workshops in their current form.
• He was manager of one of the workshops in 420.
• We'll get to the other end of the workshop through these pipes.
• No, Lowry was in one of the workshops.
• I've found Hammond's spare pontoons from the workshop over there.
• - Let's have a look at the workshop.
• Then somebody picks up a scrap of newspaper in the workshops...
• He came into the workshop, started up his van and he drove away.
• There was some bloke who came in to the workshop.
• Shortly after the murder, somebody drove Ruairi's van away from the workshop.
• The bodies are in the workshop.
• In a little room, out by the workshop.