interjection/conjunction

- an interjection is a word or short phrase that shows a sudden feeling, attitude or reaction. it could show surprise, fear, disappointment, agreement, hesitation or excitement or any other emotional response.

- a conjunction is a word phrase that joins words, phrases, or clauses. The conjunctions show how the joined parts are related. The relationship may be addition, contrast choice, reason, time, condition.

for time the words are after, before, once, since, until, when, whenever, while

for reason the words are because, since

for condition the words are if, unless, provided that

for contrast the words are although, though, whereas, while

for purpose or result the words are so that