We didnt expect you ..... it bought buying buy to be

We didnt expect you buying it. Мы не ожидали, что вы его покупайте.

We use Gerund in this sentence.

We expect you buying it.

Didnt we expect you buying it? (General question).

Who didnt expect you buying it? (Special question).

What didnt we expect? (Special question).

Didnt we or didnt he expect you buying it? (Alternative question).

Didnt we expect you or him buying it? (Alternative question).

We didnt expect you buying it, did we? (Disjunctive question).

We expect you buying it, didnt we? (Disjunctive question).