句型转换 Have you ever read the book called……?……？

按照例句转换句型

5。 to skate on thin ice can be very dangerous。 _____it must be dangerous to skate on thin ice。 6。 to buy things on the internet is very easy。 ______it must be easy to buy things on the internet。 7。 to walk for a whole day must be rather tiring 。 it must be tiring to walk for a whole day。 8。 ...全部

  5。 to skate on thin ice can be very dangerous。 _____it must be dangerous to skate on thin ice。 6。
   to buy things on the internet is very easy。 ______it must be easy to buy things on the internet。
   7。 to walk for a whole day must be rather tiring 。 it must be tiring to walk for a whole day。
   8。 to travel by plane is pleasant。 it must be pleasant to travel by plane 。收起