这句话有语法错误吗,有的话怎么改,没有的话help那里怎么解释But others,on the c

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But others,on the contrary,insist that [offering aids to strangers/helping strangers] is not only [an act] out of moral principle.but also [a way] to show their humanity.
...补了下字~
1.people help strangers 改成名词 offering help/helping
2.补上宾语 an act
3.增a way 使句子对偶
======以下答案可供参考======
供参考答案1:
有错误。help和is是同一个分句里出现了两个谓语动词，我认为仅仅把help改成helping还不能解决全部问题（people和is的搭配也有问题）。要改成地道一些的句子，最好更改两处：
1、去掉is
2、在show前加to
供参考答案2:
有错。应该是
But others,on the contrary,insist that it not only is out of moral principle but also shows their humanity for people to help strangers .
---------在这里，最好使用 it 做形式主语的结构。
供参考答案3:
个人感觉没错，people help strangers 是后面的主语