It seems schools may not be providing an opportunity for children to re-express their odeas and so have them tested and refined by teachers and their peers.

请教各位老师以下问题：

1.对于本句话，and 后面的分句的主语是谁？这个句子是不是被动句？是否因为并列句的原因，and后的分句省略了助动词be?

2.此外，and 前面的分句是否定形式，为什么这里用so 而不用neither？

谢谢老师