这两个句子的表达有些不准确
因为better是形容词 需要有be动词连接,我想楼主可能表达的是：had better 最好...
正确表述应该是 ：I had better not do any ...
had better 后面接动词 不使用助动词do 等,所以不存在第二种表达方式
例句：I had better finish my homework first.
或者用it 形式主语：
it is better for sb to do sth .对于某人来说 最好做某事
it is better for you to finish your homework first.你最好还是先把作业写完了 或者
You’d better finish your homework first.you had better可以缩写为 You’d bette