今天要学的4种英语时态，
并不是真的不存在，
而是情态动词would的4种用法：
① would do
② would be doing
③ would have done
④ would have been doing
并不是英语概念里真正的时态哟~
would的用法很多，相对有难度。
难度不是来自于用法难，
而是跟与中文概念不同，
容易造成理解困难和偏差。
举例：以 would do 为例
1、礼貌用语
- Would you like some food?
你想吃点东西吗?
- I would like to book a table.
我想订一个位子。
- I wouldn't agree with that.
我不同意。
2、虚拟语气
It would be nice if I had a heater at home.
如果家里有暖气就好了。
3、过去的习惯
He would call me at midnight. So annoying.
他以前会半夜给我打电话。好烦。
以上并非would的所有用法，
would的用法还有更多。
情态动词也有很多，比如：
will, would, shall, should,
can, could, ought to, must,
need, have to, may, might 等。
这是一个很大的体系，
值得像学时态一样好好学习。
