动词原形

　　1.can(could)/may(might)/will(would)must/should/haveto(较特殊,有人称和数的变化）等情态动词.

　　2.hadbetter/whynot/whydon'tyou/beableto/besupposedto/beusedto等词组句型.

　　3.feel/make/hear/see/what/let等动词.

　　4还有像“will/could/wouldyoupleasedo"和"wouldratherdo.thatdo...'的句型.

　　动词ing形式

　　1.finish/like/dislike/hate/enjoy/stand/mind/keep/speng/pratice/stop等动词

　　2.dosomedoing（eg.dosomeshopping)/godoing(eg.goswimming)/feellike/bebusy/insteadof/havefun/haveagoodtime/enjoyoneself/beusedto/haveadifficulttime/haveproblems/havetrouble/payattentionto/giveup等一些词组.

　　3.介词后一般加ing.如：at/in/on/of/from/for/about/with/without等.