英语语法关于动名词加S,过去分词,动词ing形式,现在分词类的问题.例如下面这篇文章,其在多处有加S和加ed形式的单词,但却不是每处都加,同一个单词有的地方加了有的地方没加,本人英语语法

　　英语语法关于动名词加S,过去分词,动词ing形式,现在分词类的问题.

　　例如下面这篇文章,其在多处有加S和加ed形式的单词,但却不是每处都加,同一个单词有的地方加了有的地方没加,本人英语语法在这方面很薄弱,求醍醐灌顶,另外求推荐一本语法书,不要太冗长,也不要太短,要能在20天左右看完的,求推荐~

　　Thechartgivesinformationaboutpost-schoolqualificationsintermsofthedifferentlevelsoffurthereducationreachedbymenandwomeninAustraliain1999.

　　Wecanseeimmediatelythatthereweresubstantialdifferencesintheproportionofmenandwomenatdifferentlevels.

　　Thebiggestgenderdifferenceisatthelowestpost-schoollevel.

　　Where90%ofthosewhoheldaskilledvocationaldiplomawereman,comparedwithonly10%ofwoman.

　　Bycontrast,morewomenheldundergraduatediploma(70%)andmarginallymorewomenreachedbachelor'sdegreelevel(55%).

　　Whilemorewomenreachundergraduatediplomalevelthanmen.

　　Atthehighlevelsofeducation,menwithpostgraduatediplomasclearlyoutnumberedtheirfemalecounterparts(70%and30%,respectively),andalsoconstituted60%ofMaster'sgraduates.

　　Thuswecanseethatmorementhanwomenholdqualificationsatlowerandhigherlevelsofeducation,whilemorewomenreachundergraduatediplomalevelthanmen.