15. The conjunction whether" is used to show
A comparison
C. reason
B. condition
D. season
16. The main clause is also known as
A. dependent clause
C. subordinating cause
B. independent clause
D. supreme clause
17. A category of subordinating conjunctions which
connect the two clauses together by showing a time
relationship between the two of them
A. concession
C. manner
B. comparison
D. time
18. The subordinating conjunctions under the
category of show how something is done.
A. concession
C. comparison
B. manner
D. reason
suthordinating​