….perfectly well ….(বেশ ভালো করেই)

তোমাকে কীভাবে কথা বলাতে হয় তা আমরা বেশ ভালো করেই জানি।=We know perfectly well how to make you speak.

তুমি বেশ ভালো করেই জানো, এমন পরিস্থিতিতে কী করতে হয়।= You know perfectly well what to do in a situation like this.

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Example 1:

We know perfectly well how to make you speak. (We know how to make you speak and we know that perfectly well.)

Example 2:
You know perfectly well what to do in a situation like this. (You know what to do in a situation like this and you know that perfectly well.)