Ask questions about the sentence: The Head Teacher proposed that…

The head Teacher proposed that we come to his school for 15-20 days in April.1 Did the head teacher propose that we come to his school for 15-20 days in April? 2 Who proposed that we come to his school for 15-20 days in April? 3 Where do we come for 15-20 days in April? 4 When do we come to school for 15-20 days? How long do we come to school in April?