Задайте 5 вопросов (вопрос к подлежащему, общий вопрос, альтернативный вопрос, специальный вопрос и разделительный вопрос) к предложению:
He started to swim but it was not easy.

1) What did he start?2) Was it easy to swim?3) Did he start to swim or to run?4) He started to swim, didn't he?5) Did he start to swim?6) 

Who started to swim?Did he start to swim?Did he start to swim or to skate?What did he start to do? He started to swim, didn`t he?