He acted as though he __________ the competition.

• As if / as though এর পূর্বে present indefinite tense থাকলে as if / as though এর পরে past indefinite/perfect tense হয় এবং be verb থাকলে সবসময় were হয়।
যেমন:
- He speaks as if he were mad.
- He talks as though he were a child.

• আবার,
As if / as though এর পূর্বে Past indefinite tense থাকলে As if / as though এর পরে past perfect হয়। যেমন:
- He looked as if he had not slept for days.

Correct sentence: He acted as though he had won the competition.