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Swabbed as in the action "to swab" or "to clean" is a verb.
A verb is a word that describes either an action (walk, run, etc), an occurrence (become, happen, etc) or state of being (stand, exist, etc).
yes
Of course not.. He is just looking to have his bayonet swabbed by someone different..
No.
If you use one that isn't sterile, you will not know where the bacteria are from. The swab or the area you swabbed.