" A phrasal verb consists of a base verb and one or more prepositions. " We consider all the words in a phrasal verb to be part of a verb phrase - they cannot be omitted without changing the meaning of the verb. Often the meanings are idioms, because you cannot derived the meaning from the individual word definitions.
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virginia274I want to know what's the role of "forward" in Be looking forward to... I think it's a particle. Am I right?Yes. A particle is a preposition (in most cases) that complements a verb and doesn’t take any complement of its own. Look forward to… is a verbal idiom consisting of three constituents: verb + preposition + preposition phrase.