Write these sentences in another way, beginning as shown.
It’s expensive to maintain a car. A car ***.
is expensive to maintain
It’s difficult to understand him. He is difficult to understand.
It’s quite easy to use this machine. This machine is quite easy to use.
It was very difficult to open the window. The window was very difficult to open.
It’s impossible to translate some words. Some words are impossible to translate.
It’s not safe to stand on that chair. That chair isn’t safe to stand on. (short form)
It’s expensive to maintain a car. A car is expensive to maintain.