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