No, “be” is not a preposition. It is a verb, specifically the base form of the verb “to be.”
Function of “Be” as a Verb:
- As a Linking Verb (Connecting the subject to a complement)
- The restaurant will be open at 9 AM.
- She wants to be a chef.
- As an Auxiliary (Helping) Verb (Used in passive voice and continuous tenses)
- The order is being prepared.
- They will be arriving soon.
Why “Be” Is Not a Preposition
- Prepositions (e.g., in, on, under, about) show relationships between words in a sentence.
- “Be” does not function this way; it is a verb that indicates existence, state, or action.
Thus, “be” is a verb, not a preposition.
