He got/was stabbed by a knife. (only possible if, say, he (accidentally) fell on a knife) He got/was stabbed with a knife. (someone else stabbed him) All (of) the people were astonished.
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shaunAnd in using "all of the" and "all the"All of the people in the hall were astonished All the people in the hall were astonishedUse "of" when talking about a single entity, and not when talking about a group.