Frost uses irony with analogies to argue that his apple trees will not eat his neighbor's pinecones. Frost writes: He is all pine and I am apple - orchard my apple trees will never get across and eat the cones under his pines." Again it is clear he is using humor and satire in this poem in a way to incite us to understand his point of view. .
Frost also uses some strong irony in "Departmental" and "Provide" which both have some sarcasm involved. In "Provide Provide" Frost writes "The picture pride of Hollywood too many fall from great and good". Frost is saying that the fame and glory of Hollywood ends to soon because no one can stay beautiful all their lives, then he argues that you better die young before this happens. Here is a strong sat ireful meaning "Better go down dignified with boughten friendship at your side than none at all Provide, provide!" He is clearly making a joke of the materialistic world and believed in down to earth simple things. In the poem "Departmental" my opinion is that Frost is giving his conception about the government and he demoralizes the concept of the departments. Frosts comparison of ants and the government are that only the busy ants are interested in their own duty, also when the ants see one of their dead they just carry on with business without an emotion or reaction; there is a strong parallelism to the human society. His message is unmistakable when you reach the resolution of the poem: "It couldn't be called ungentle, but how thoroughly departmental." You cannot use more satire then this. He is in both poems making the society around him seem both unintelligent and lost, he feels like he is superior to all others but at the same time he feels isolated from the world around him.
In the poem "To E.T." Frost makes use of some ironary. In the beginning of the poem it seems to be a simple allege but after third line second stanza you realize that Frost tells about how his friend was a better soldier than a poet and because he has died he is remembered as both.