1、一般在動詞原形末尾加ing,如do→doing、sing→singing、comfort→comforting.
2、以“不發音的e”、ue結尾的動詞,先去e,再加ing,如dance→dancing、like→liking、write→writing、make→ making,take→taking.
3、以ee、oe、ye結尾的動詞加ing,如see→seeing、toe→toeing、dye→dyeing.
4、以重讀閉音節結尾的動詞,並且末尾只有一個輔音字母,應雙寫這一字母再加ing,如cut→cutting、swim→swimming.
5、以ie結尾的動詞,要改ie為y再加ing,如die→dying,lie→lying.
6、以ic結尾的動詞,要改ic為ick再加ing,如picnic→picnicking,traffic→trafficking.