2013年PETS3三级写作文章原因结果句型：基本原因1
2013年PETS3三级写作文章原因结果句型：基本原因1
基本原因
92.There are probably many（several/three/a number of/a variety of）reasons（causes）for this dramatic（marked/significant/extraordinary）increase（decline/growth/change）in…First…Second…Finally …
93.Why have（did/are）…?For one thing（One reason is）…For an-other（Another reason is）…Perhaps the main（primary/fundamental/most important）reason is…
94.It is no easy（simple）job（task/matter）to offer（identify/advance）the reasons for this phenomenon（tendency/change）which involves several（many）complicated factors. For some…For others…
95.It is fairly easy（You don’t have to look very far）to find out（identify）the reason that（why）…
96.The answer to（explanation for）this problem（phenomenon）involves many（several）complex（complicated/interrelated）factors（reasons）.For one
thing（Some），…For another（Others），…Still another （Still others）…
97.The reasons（causes）for…，perhaps（probably/I suggest），are varied（complicated/profound/many）.They include（lie in the fact）…Perhaps the main reason（cause）is…
98.Thanks to（Owing to/Due to/Because of/As a result of）
99.The increase（decline/change/success/failure）mainly stems/results/arises/comes from（①is chiefly caused by/because of/born of ②is largely due/owing/attributable to）the fact…（several factors）.
100.in part（partly）because…in part（partly）because…
101…not（not only/not so much）because…，but（also/as）because…
