4. go swimming = go to swim(不常用) 去游泳 与go shopping同类型
swim (过去式) swam swimming pool 游泳池5. pretty good 相当好 pretty = very 相当，很（这是一个副词）
a pretty girl 一个漂亮的女孩 pretty = beautiful 美丽的，漂亮的（形容词）
有些副词可以修饰另外一个副词或形容词：
The weather was pretty good. （修饰形容词）
Tom did pretty well in the test. （修饰副词）
单词学习
动词：are---were rain---rained cry---cried
make---made feel---felt walk---walked
decide---decided
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