1."mayaswellnot…as"结构，此结构可译为"与其……不如不……"
Onemayaswellnotknowathingatallasknowitbutimperfectly.
2."haveonlyto…do"结构，此结构表示"只须(消)……就能……"的意思
WehaveonlytoturntothatextraordinarydiscoverymadebyEdisontoseethesignificanceofit.
3."asitwere"是一个非常常用的插入语，意思是"好象"，"可以说"等。
Apieceofironnearamagnet,thoughapparentlyseparatefromit,feels,asitwere,thethreadsofthisattachment.
4.复杂结构，在下面例句中，由于anyone的定语从句过长，把谓语mustrealize提到定语从句之前。
Plainlyenoughthatistoolargeanorder,asanyonemustrealizewhoreflectsuponthemannerinwhichtheyreachpublicoffice.
5."not…anymorethan…"为："不能……，正如不能……"。
Onecannotlearntosketchandexpresshimselfgraphicallyonlybyreadingaboutitanymorethanonecanlearntoswimwhilestandingbythepool.
6."Bythatasitmay"是"Letitbethatasitmay"的省略形式，是由"be"引起的另外一种假设结构，意思是"虽然如此，尽管这样"。
Itissaidthatthenervepoisonisthemoreprimitiveofthetwo,thatthebloodpoisonis,sotospeak,anewproductfromanimprovedformula.Bethatasitmay,thenervepoisondoesitsbusinesswithmanfarmorequicklythanthebloodpoison.
7."ifatall"是一个由"if"引起的主谓结构不完整的短句结为"即使……"等。
Icanseeonlywithgreatdifficulty,ifatall.
8.由there引起的句型容易产生复杂的句子结构。
Therehavebeenopeneduptothevastandexcellentscience,inwhichmyworkisthebeginning,waysandmeansbywhichothermindsmoreaccuratethanwinewillexploreitsremotecorners.
1)动词短语相关部分被分隔(当"makeuseof"，"takenoticeof"，"payattentionto"，等动词短语变成被动语态时)。
Useismadeofsolarenergyinheatinghouses.
2)双重定语引起的分隔
Butthereisofcultureanotherview,inwhichnotsolelythescientificpassion,thesheerdesiretoseethingsastheyare,naturalandproperinanintelligentbeing,appearsasthegroundofit.
10."tobedoing…when…"是一个句型，多译为"某人正在做……时，突然……"。在简单的句子中容易看出，一旦句子变得复杂一些，可能就不太容易识别这种句型。
Shesaidsheandafriendhadgoneouttodinnerthatnight,andwerewalkinghometogetheratabout10o'clock,whena"verybig,verytallman",accostedthemanddemandedtheirpurses.
语法知识是英语学习的基础，对写译、阅读等题型有直接影响，同学们在英语备考中要注重语法知识的积累。新东方在线四六级教研室期待各位考生取得理想成绩。
