consider if it is necessary to do something 能不能省略is?

这英语对吗 it is necessary to do something = it is requisite to d It is necessary to do 的例句 I think it important for us to do something 什么情况下is可以省略吗? It is easier to remember to do something if you do it____ __ 关于necessary.it is necessary to do sth.it is nec 英语翻译Similarly,it is necessary to determine if these effects if （it is） necessary是什么现象,假设都可以省略? I think it necessary to do sth.还是 I think it is necessary to Is it necessary for sb to do sth 同义句 英语作文Is it necessary foryou to do sports? It is not necessary to do this work if it is necessary /if necessary /when it is necessary 意思一样吗