celebrate _ celebration,pronounce _ pronunciation, decorate _ decoration
B. discuss _ discussion, invent _ invention, attract _ attraction
impress _ impression,inject _ injection,instruct _ instruction
（4）.其它：
know _ knowledge, please _ pleasure, enjoy _ enjoyment,
practise _ practice， die _ death, succeed _ success, weigh _ weight,
sit _ seat, change _ chance，enter _ entrance,fly _ flight,
rob _ robbery, discover _ discovery，faile _ failure,appear _ appearance, breathe _ breath
7、动词加ing规则：
（1）.一般动词直接加ing，如：sing—singing, laugh—laughing, help—helping, say—saying, draw—drawing, sleep—sleeping, 等等；
（2）.以不发音的e 结尾的动词，去e加ing。如：have—having，make—making, write—writing, skate—skating, dance—dancing, love—loving,等等；
但dye—dyeing,（是为了区别die—dying的原因）；以ee结尾的词不受此限制：see—seeing, agree—agreeing,等等。
（3）.以重读闭音节结尾的动词，末尾只有一个辅音字母，双写这一辅音字母，再加ing。（注，字母y, w 不双写）。如：
sit—sitting, put—putting, run—running, rid—ridding, skim—skimming, swim—swimming, stop—stopping, shop—shopping, refer—referring, forget—forgetting, regret—regretting,等等。
另外，① 以-l结尾的双音节词及少数其他词，在英国英语中常双写，而在美国英语中则不常双写。如：travel—travelling/traveling, equal—equalling/equaling, quarrel—quarrelling/quarreling,
worship—worshipping/worshiping,做礼拜；崇敬；
②词尾是x时不双写：box—boxing把…装箱/盒；
（4）.以ie为结尾的动词，先将ie变为y,再加ing。
die—dying，lie—lying, tie—tying,等等。
（5）.特殊情况：picnic—picnicking，
8、动词变形容词小结
（1）.词尾加ful:
use - useful, care - careful, help - helpful,thank - thankful
peace - peaceful, forget - forgetful, play - playful,
succeed - successful, wonder - wonderful
（2）.词尾加d或ed:
please - pleased, unite - united, excite - excited,
surprise - surprised, organize - organized, close - closed,
wound - wounded, relax - relaxed,develop - developed,
（3）.词尾加ing:
interest - interesting, surprise - surprising, excite - exciting
develop - developing, frighten - frightening,thrill - thyrilling
frustrate - frustrating, relax _ relaxing, live - living
rock - rocking, sleep - sleeping
（4）.词尾变y为i,加ed:
worry - worried, marry - married,fry - fried, terrify - terrified
satisfy - satisfied
（5）.词尾加able:
know - knowledgeable, enjoy - enjoyabe,suit - suitable
adjust - adjustable, comfort - comfortable
（6）.其它：
lose - lost, fool - foolish, live - lively / alive /living,
sleep - sleepy / sleeping / asleep,wake - awake, taste - tasty
speak - spoken, break - broken, die - dead, educate - aducational,
world - worldwide
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