it's necessary for sb to do sth能翻译吗?

it's necessary是什么意思 it's necessary for you to give up smoking(保持句子原意) it's necessary ____you____smoke It‘s necessary for us___(learn)English well说明原因 英语翻译It's necessary for us to have a meeting. it's necessary for us to have healthy eating habits it's necessary for us to have healthy eating it's necessary for you___(eat)three meals a day It's necessary for sb.to do.(中文意思） 应该是It's necessary for keep fit.为什么正确答案确是It's necessary to keep fit. 是it's necessary for us to sleep for 8 hours 还是is' necessary for us to sleep 8 hours? it necessary it necessary for是不是it's necessary for的简单形式,请问它原来的结构是什么?我记得这好像是个简单形式 I thought____us students to have plenty of exercise every day.A.It's necessary to B.it necessary for C.it necessary of D.it's necessary of请教选什么为什么 It's necessary to learn English well. 翻译it's not necessary to hurry It's necessary这是什么形式? It's not necessary _________________(相同的) it's necessary for us to learn english well同义句 it's necessary aand important for students to take enough exercise