Used is a verb (past tense of use) and an adjective (a used car).
The word "us" is a pronoun.
The word "us" is a pronoun.
A preposition
The word "us" is a pronoun.
"forgetful" is an adjective.
adjective
In the sentence "let us move on," "on" is a preposition.
The word our is a pronoun. It means to belong to us.
A noun, the name of the sound or act of laughing.
Amendment I.
The part of speech for this particular word is a noun.
part of speech