The - article adj
Bill - SN
Must be paid - verb phrase
By - preposition
Whoever purchased the lumber - noun clause obj of the preposition
It is necessary to give credit to the words and ideas from the original author because if you do not you are plagiarising also if you plagiarize while writing a book without quotations or referring to the author it is illegal.
Monotone means having no expression in your voice, no anger, no happiness, no interest. This word would affect the tone by giving the reader the feeling that he just doesn't care about what is going on/ what he's talking about. I hope this helped!
