If they had more money, they _______ a new house.

Should buy

Will be buying

Would buy

Have bought

This is the second type of Conditional Sentences.

Formula: If + past simple, would/wouldn't + verb

If they had more money, they will buy a new house اگر ان کے پاس زیادہ پیسے ہوتے تو وہ نیا مکان خرید لیتے ہیں