if necessary 的同义句是什么?

if necessary 的同义句是什么? To take medicine on time if necessary 的同义句 同义句是什么?To keep healthy is necessary. If it is used many times 的同义句是什么 To keep healthy is necessary.(同义句) They have to rent a new house改同义句 You can ask them for help if necessary.改同义句 这个英语句子的同义句是什么?she always tries her best 同义句Please tell her if she doesn‘t know it.同义句 necessary的反义词是什么 It is necessary to give the fish clean water的同义句 It is not necessary to have a new building in our school.的同义句 It isn't necessary for you to come tonday的同义句 It is very necessary to speak english aloud的同义句是? If you don't go to the meeting,I will go instead.的同义句是什么? if you don't get up early,you will be lated的同义句是什么 I'II give you a hand if you have any problem的同义句是什么 If you sleep too long you may fall into a deep sleep的同义句是什么 if only ,if necessary lt is necessary to study hard at school.同义句