প্রশ্ন: Not until a monkey is several years old, ___ to exhibit signs of independence.
(ক) it begins
(খ) does it begin
(গ) and begin
(ঘ) beginning
ব্যাখ্যা:
Rule: ‘Not until’ clause শুরুতে এলে main clause-এ inversion হয়। Structure: Not until + clause, auxiliary + subject + verb.