What would you like to drink? 的回答:I would like to drink some tea.对吗?

前句对，后句错，应是I would like some tea.

语法上没有问题。如果将some 改成 a cup of 就更好了！

对的

或者更准确的可以说：I would like to drink a cup of tea.
依情况而定

对。
不为什么，这样说礼貌一些～～

完全正确

对。