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Reply to "When+v. ing"

Hi, Wael Shaltoot,

 I do know that"when" can work as a preposition.

No, "when" is always a conjunction.

Is it correct to say"When meeting Tom,I was walking home".

No, that is not correct. You could say:

When walking home, I met Tom. (I strongly prefer "while" in this case)

Can "When" work as a prepostion or be  part of an  abridged adverbial  phrase with all tenses? 

"when" can introduce abridged adverbial clauses, usually — if not always — when the verb be forms part of the full verb.

When/While (I was) walking home, I met Tom.