be necessary for和 be necessary to的区别老师说be important to后面加人,如果还有下文用be important for sb doing sth那be necessary to 和be necessary是不是也是这种用法?还是说be necessary to do sth be necessary for doing sth打错了,be important for sb to do sth

be necessary to对…来说是必要的；对…有必要
it may not be necessary to you： 也许对你来说没必要
be necessary for sb. to do sth.： 对某人来说做某事是必要的
It should hardly be necessary to say more.
到此已经不用再说什么了.
In my opinion, it may be necessary to charge for participation.
我的意见是有必要让参加者付些费用.
be necessary for对……有必要
be necessary for sb： 对某人来说是很需要的
be necessary for sb to do ..： 对…来说有必要
But I'm afraid that it will be necessary for us to ask you to change rooms for the last two nights：
I think that the on-site training will be necessary for the tank.
我想槽罐焊接工作的现场培训是必要的.
Would it be necessary for me to pay all the money before the trip?
我必须在旅行出发前支付全部费用吗?
Battlefield information for one squad may not be necessary for other squads.
针对一个小组的战场情报未必是别的小组所需要的.
后面常加名词.
其实,记住这个就完了.
be necessary for sb to do ..： 对…来说有必要