Watching English programs on TV is a good way to learn English.（改为同义句） （ ） a good way to

题目

Watching English programs on TV is a good way to learn English.（改为同义句） （ ） a good way to
learn English ( ) watching English programs on TV.

答案

（ It is ） a good way to learn English by watching English programs on TV .
It is +N.+(for sb) to do sth by doing sth.