表示对于时 for与to的区别why are machines so important and necessary _________(to/for)us?为什么不用for.

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表示对于时 for与to的区别why are machines so important and necessary _________(to/for)us?为什么不用for.
表示对于时 for与to的区别
why are machines so important and necessary _________(to/for)us?为什么不用for.

表示对于时 for与to的区别why are machines so important and necessary _________(to/for)us?为什么不用for.
to and for us- this is just one example of a very tricky word..the truth is..both can be used in situation..but for this sentence...necessary for us is not commonly used in english conversation
for
is it useful for those students?correct
but
it was very useful to him- correct...
i can only say that to is better in this case..
both can be used..all make sense

这个问题经典,希望得到答案

be important /necessary to sb ,习惯说法,to 对...来说,for 为...

我想这个跟be good for/to 很相似。
当说对人的健康和品质时,用for
其余的用to
这里是说这个机器对我们来说是重要的。是说给我们提供方便。所以我认为用to

be necessary to 为...所必需
be necessary for 有...的必要