Question

would you please (not do/not to do)such a thing again.选哪一个？为什么

Answer 1

not do，因为would是情态动词啊，所以后面要接do，否定就是not do，这句话用陈述语序看就是I would not do such a thing again,

Answer 2

not do.do 在此句子中充当谓语成分。