Denny : Mr. Hendra, I`d like you to come to my birthday party next Sunday.
Mr. Hendra : That`s very kind of you, but I`m afraid I can`t. I have already made an appointment. Have a nice party.
The underlined sentence in the dialog above is.
a. An apology
b. An invitation
c. A large taking
d. A greeting
e. Agreement

- "a nonrestrictive clause functions as a modifier to a noun (that is an object, person or concept). these clauses can be described by the following three options: it is set off by comas, it contains a subject and a verbs and it adds nonessential information to the sentence.

for example, in "here is bill gates, who confounded microsoft software company" we can identify "who confounded microsoft software company" as a nonrestrictive clause modifying the noun bill gates. this clause can be describes as a nonrestrictive clause because it is separated by a comma, it adds nonessential information to identify who bill gates is and it must contain both a subject (who) and a verb (confounded)."