Answer these questions using the modals from the help box. The hints given in the brackets will help you choose the correct modals.
must have
couldn't have might have
ought to
should
a) How did he get tickets for the fashion show tonight? (booked in
advance)
b) Why are the streets full of water this morning? (rained so heavily)
c) How will she manage to lose so much weight? (exercise regularly)
d) Did you forget to lock the gate last night? (forgotten)
e)
Where is the screwdriver? (in kitchen drawer)

the answer is c. the wind

a complex sentence consists of an independent clause and one or more dependent clauses.  

to write complex sentences, we must use subordinating conjunctions.  

all the complex sentences begin with a subordinating conjunction and when it occurs, a comma must be place at the end of the dependent clause. on the contrary, if the sentence begins with an independent clause, then no comma is used.

after  

although  

as  

because  

before  

if  

since  

when  

for example,  

after she won the competition, she became very popular.  

although my father was hurt, he continued fighting for his rights.  

as all of you got a ten, you will be able to leave early today.  

before he went to the war, he asked his parents to bless him.  

if it is cold, i won’t go out.  

since you didn’t bring the homework, you will get low grades.  

when it is hot in the town, everyone goes to the beach.