“to be good at learning is important”同义句

“to be good at learning is important”同义句 两个英语小问题,1.To be good at learning is important.请问这句的成份是什么,难道是 lt is important to have a good rest同义句 to be careful with fire is important（同义句） To be healthy for us is important的同义句 Learning English well is important 改为同义句 Learning English is very important的同义句 Learning English well is very important.同义句 learning english well is important for us.(同义句） learning english well is important 同义句转换 To keep in good health is very important.用it作主语改为同义句 Haveing a good lifestyle is important to us.改为同义句