1.普通动词：直接 ing;
think—thinking sleep—sleeping study—studying
speak—speaking say—saying cry—crying
2.以不发音的e结尾的动词：去掉e再加ing，去e ing
wake—waking make—making come—coming
take—taking leave—leaving have—having
dance—-dancing ride—-riding write—writing
3. 以重读闭音节结尾，呈现“辅，元，辅”结构的动词，先双写末尾的辅音字母，再加ing
stop—stopping sit—sitting run—running forget—forgetting
begin—beginning cut—cutting get—getting hit—hitting set—setting swim—-swimming fit—fitting dig—digging shop—shopping put—putting travel—travelling(可双写也可不双写) refer—referring prefer—preferring
4. 以ie结尾的动词，把ie改为y ，再加ing lie—lying die—dying tie—tying
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