the most we can realistically do is monitor the situation and allow for the changes

这个句子中，为什么is后面接的不是to do形式
为什么不是is to monitor and allow for,而是is monitor。。 补充原句,Maria Colehill of Forestlife, an American conservation body, thinks that in the case of climate change, the most we can realistically do is monitor the situation and allow for the changes that we cannot prevent, while lobbying governments internationally to make the changes to the pollution laws.
那位好心人帮我分析下这个句子，谢谢

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