The ladder is kept against the wall.
The preposition "against" is used here to describe the position of the ladder relative to the wall, indicating that the ladder is leaning on or touching the wall.
He is an amazing artist.
The adjective "amazing" is used to describe the noun "artist". It indicates that his art is impressive or excellent.
I often visit my grandparents.
The adverb "often" modifies the verb "visit" by describing how frequently the action occurs, implying that visiting happens regularly.
The gardener waters the plants every day.
The verb "waters" describes the action performed by the gardener, which is the act of providing water to the plants.
English is my favorite subject .
The noun "subject" indicates what is being liked. In this context, it refers to the area of study or teaching within the educational system.