Foundation
English
Reading Comprehension
Reading Comprehension
Vocabulary
Question
Is it going to rain?
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Solution
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If the question is beginning with an auxiliary verb (is/ does/ did/ are/ can, etc), then, the answer in the 
(i) affirmative form will be: Yes + pronoun + auxiliary verb
(ii) negative form will be: No + pronoun + auxiliary verb + n't (not)

Answer in affirmative: (a) Yes, it is. 
Answer in negative: (b) No, it isn't.