Doing experiments is difficult 同义句

Doing experiments is difficult 同义句 there is nothing difficult.please go on doing it.（同义句）. 英语改同义句:doing the things as a person is difficult for robots. 同义句：This question is difficult. This question is difficult(改为同义句) Soccer is difficult.（同义句转换） doing sports is really relaxing同义句 It is worth doing sth同义句 English is diffcult .physics is more difficult改为同义句 THIS QUESTION IS DIFFICULT改同义句THIS IS _________QUESTION to learn English well is very difficult.同义句 同义句lesson ten is more difficult than lesson nine