in/with/on prepositions

[pradeepsaxena]

I want to know whether it is correct to say I am with IBM. or I am in IBM.
I am in bed .or I am on bed
If both sentences in each pair are correct what is the difference between them.

[SoothingDave]

If you mean you work for IBM, then say "I'm with IBM." I can't think of a reason to say "in."

You are "in bed" if you are lying down under the covers, like you would to go to sleep.

You can be "on the bed" if you mean sitting or lying on top of the covers.