Topics: Modal Verbs and Conditionals
Is used in dealing with things or change in past scenario yielding to different results. It is formed using this structure: condition – if + past perfect; main clause – would have + past participle.
A. Zero
B. First
C. Second
D. Third
Select your answer:

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Tenses Usage › ViewNone of the renewable energy sources _____ completely free from environmental impact.
A. is
B. are
C. has been
D. have been
Transitional Words › View
Virtual classes __________ as regular classes.
A. as good are
B. are not as good
C. isn’t as good
D. are different
