About of question with preposition at the end

[Bachram]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #7 "English Grammar Prepositions", question 3

I'm off on Monday.

(a) having a holiday
(b) having an extra day
(c) having a long day
(d) having a short day

English Idioms and Expressions, Advanced Level

ESL/EFL Test #7 "English Grammar Prepositions", answer 3

I'm having a holiday on Monday.

Correct answer: (a) having a holiday
_________________________

I'd like to know everything about of question with preposition at the end.

Bachram

[Yankee]

What exactly are you unsure about?
What sorts of questions are you referring to?