not to smile，not to touch视作定语还是状语，如果是状语，是充当什么状语？

It is considered unfriendly not to smile

It is best not to touch unless you are sure the other person is comfortable with it.

这两句里的not to smile，not to touch视作定语还是状语，如果是状语，是充当什么状语？

It is considered unfriendly not to smile.

It is best not to touch unless you are sure the other person is comfortable with it.

两个不定式，既不是定语也不是状语，而是句子的主语（it 是形式主语；真正主语不定式被外置）。现在，去掉形式主语It后：

1. Not to smile is considered unfriendly.

2. Not to touch is best unless you are sure the other person is comfortable with it.

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