1. They will often be actually over the water.2. Norway has

1. They will often be actually over the water. Will they often be actually over the water.? Who will often be actually over the water? They will often be actually over the water or under water? They will often be actually over the water, won't they? Where will they be actually?

 
2. Norway has a long history of fishing.
Has Norway  a long history of fishing?  Norway has a long history of fishing, hasn't it? Norway has a long or shot history of fishing? What a long history has Norway ? What country has a long history of fishing?

3. Fish remains a common dish.
Fish remains a common dish, doesn't it? Does  fish remain a common dish?
What does  remain a common dish?  Does Fish or meat  remains a common dish?

4 Restaurants tend to be concentrated in city centres.
Restaurants tend to be concentrated in city centres, didn't they?
Where  did  restaurants  tend to be concentrat ?
Did  restaurants  tend to be concentrat  in city centres?
 Did  restaurants  tend to be concentrat  in city centres orcity outskirts ?
What did  tend to be concentrat  in city centres?