Petit coup de main s.v.p : Je dois faire le contraire des phrases suivantes : 

1 - Every Saturday Ken has to start work early.

2- Last week, he had to check the diving gear.

3- Next week, he will have to check the boat safety 

4- When he has to clean up the boat, it takes himan hour.

5- Last month he didn't hava to dive at all. Instead, he had to teach the biginners about their gear.