Grammar — Conditionals Type II & III

"If I had enough money, I would buy a Ferrari."

ما نوع هذه الجملة الشرطية؟ وما التركيب النحوي الكامل لها؟

"If I had had enough money, I would have bought a Ferrari."

ما نوع هذه الجملة الشرطية؟ وكيف تختلف عن الشرط الثاني؟

"I would be very unhappy if my friends didn't come to the party."

لماذا didn't وليس don't في جملة الشرط الثاني؟

"Your brother wouldn't have found such a nice job if he hadn't had a university diploma."

لماذا hadn't had وليس didn't have في الشرط الثالث؟

"If I had won the lottery, I would have built a huge house by the beach."

كيف نحوّل هذه الجملة من الشرط الثالث إلى الشرط الثاني؟ وما التغيير في المعنى؟