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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