Составить все типы вопросов к каждому предложению.
1) It snows very often in Russia in winter.
2) Birds fly to the south every year.
3) These books are really interesting.

1) It snows very often in Russia
 Does it snow very often in Russia?( общий)
Where does it snow  very often? (специальный)
Does it snow very often in Russia or in Great Britan? (альтернативный)  
It snows very often in Russia, doesn't it?( разделительный)
What snows very often in Russia? ( к подлежащему)