She smiled at me as if she _______ me for years.

• As if / as though এর পূর্বে present indefinite tense থাকলে as if / as though এর পরে past indefinite এবং be verb থাকলে সবসময় were হয়।
Example:
He behaves as though he owned the house.
He speaks as if he were mad.

• As if / as though এর পূর্বে Past indefinite tense থাকলে as if / as though এর পরে past perfect হয়।
Example:
She smiled at me as if she had known me for years.