英语语法4道题目～

英语语法4道题目～
1.Suppose you had a million dollars- how would you spend it?
这句是相当于if的 与现在事实相反 的虚拟用法吧?
Suppose you didn't know where your next meal was coming from?
请问suppose有虚拟用法吗?这句与if三种时态（与过去、现在、将来事实相反）中哪种对应呢?不清楚为何是didn't know .
2.He always talks as if he were addressing a public meeting.
要是虚拟应该是addressed,所以是as if 陈述语气用法吧 那能用was addressing吗?
3.I wish I had bought a map with me.
我觉得用bought对,是wish的与现在事实相反,意味现在没带地图.
4.He looks as though he never got a square meal,but in fact his wife feeds him very well.
我觉得用he never had gotten...因为是他看起来过去没有吃充足的饭,就是吃饭的状态已经发生.所以是与过去事实相反的虚拟,用had done.