Nothing serious,is it?怎样回答?Nobody came here,didn't they?怎样回答

Nothing serious,is it?怎样回答?Nobody came here,didn't they?怎样回答 nobody knew it ,didn't they.改错 It‘s nothing serious,____doctor?用Yes,（it is serous）;要用No回答,后 When is it怎样回答? Nothing is serious,is it/isn't it I hope nothing is serious 的回答是什么 Is it （）? Nothing serious. It is here如何回答 When is it怎样回答?什么意思! is it rainy today 又怎样回答? there is nothing serious和it's nothing serious nobody is here,are they?___,nobody