Correct Answer: Option A
If যুক্ত sentence, conditional sentence .condition sentence চার প্রকার ।যথা-
a.zero conditional sentence
b.first conditional sentence
c.second conditional sentence এবং
d.third conditional sentence.
*if এর পর past tense থাকলে তা second conditional sentence.
✿structure -- If+past+would/could/might+verb এর present form
structure অনুসারে শূন্যস্থানে knew বসবে।
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