across,cross,through,over的用法区别：across,cross是横过的意思,across是介词,通常在用go,run,swim.等搭配；cross是动词,通常可以直接放在句子中；through是穿过,跟across一样介词,通常在用go,run,swim.等搭配through与cross的不同在于：through是从中通过across是从事物表面穿过；over是越过,在…上方.

　　eg.①Iwentacrosstheroad=Icrosstheroad.我横过马路(经斑马线)

　　②Theriverrunsthroughourcity.这条河流经我们市.

　　③Hepassedthroughthehall.他穿过大厅

　　④IswamacrosstheChangjiangRiver20yearsago.20年前我横渡了长江.

　　⑤Lookleftandrightbeforeyougoacrossthestreet.过马路时要左右看.

　　⑥Sheputablanketoverthesleepingchild.她给熟睡的孩子盖上毯子.

　　⑦Sheclimbedoverthewall.她翻过墙去.

　　⑧abridgeovertheriver横跨河面的桥

　　⑨Theyheldalargeumbrellaoverher.他们给她撑起一把大伞.