高中句子改错The children are forbidden to do anything but to study这道题谓语动词时are还是do?怎么判断啊

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高中句子改错
The children are forbidden to do anything but to study
这道题谓语动词时are还是do?怎么判断啊

此题的错误在于but to do 要改为but do.
此处but是介词,后面用to do,但是前面有do 做实意动词“做”则but 后面用动词原形.