He is/was 简写He's
do not 简写don't
did not 简写didn't
does not 简写doesn't
can not 简写can't
I would like to do something 简写I'd like to do something.
这些都是句子里面的2个单词合成一个单词,可以以此类推.此外还有单个单词的缩写,但很少用.一般是在朋友见网络见交流或者是商务信函来往中用得多,比如your简写ur.
还有一些是国际通用术语的简写：比如FOB(free on board),CIF（Cost,Insuranceand Freight),FIFA(Federation Internationale de Football Association).
总之,英语简写很多,看用途而定.