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-That key will be put back where it belongs as soon as we know the draw hasn't been opened.
-That key will be put back where it belongs as long as we know the draw hasn't been opened.

Could you comment on these sentences?
Comments  
-That key will be put back where it belongs as soon as we know the draw hasn't been opened.

This sentence means that when you are sure the drawer hasn't been opened, you will put the key back where it belongs.

-That key will be put back where it belongs as long as we know the draw hasn't been opened.

This sentence means that you must be sure that the drawer hasn't been opened, and once you are sure of that, THEN you'll put the key back. "As long as" is a conditional phrase. Kind of like "if". So you COULD say, "That key will be put back where it belongs IF we know the drawer hasn't been opened."

I hope that helps!
Maj, I loved this question.

And thanks for the help, there, language prodigy.
Students: We have free audio pronunciation exercises.
haha, I'm not language prodigy, Pastel! I struggle like everybody else!