I don’t know which shirt to buy. I (might) ____ buy the blue one.

I don’t know which shirt to buy. I might buy the blue one.

Я не знаю, какую рубашку купить. Я мог бы купить синею.

Don’t I know which shirt to buy?

Who doesn’t know which shirt to buy?

What don’t know I?

Don’t I or doesn’t he know which shirt to buy?

Don’t I know which shirt or hat to buy?

Don’t I know which shirt to buy or to sell?

I don’t know which shirt to buy, do I?

Might I buy the blue one?

Who might buy the blue one?

Might I buy the blue one or the green one?

I might buy the blue one, might not I?