cross和across的区别

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的不同在于方向
through是直过cross是横过 例:
I went across the road = I cross the road
我横过马路(经斑马线)
The car went through the road
汽车经过马路(沿着马路)

最重要的一点，cross做动词用为穿过；而across因为是a-，所以是副词和介词穿过、横过。
cross the street表示（走）穿过街道表示动作，而across the street表示 在街道的另一边、对面，可以用来指示位置。

cross=go across穿过，穿
cross your heart画十字，发誓保证
get across柯林斯英汉双解大词典
get across ( getting, got, gotten, gets )
1. PHRASAL VERB When an idea gets across or when you get it across, you succeed in making other people understand it. 被理解; 把…讲清楚 例： Officers felt their point of view was not getting across to the generals. 军官们觉得将军们还没有理解他们的观点。
以下是21世纪英汉词典中对get across的解释
get across (使)越过，(使)渡过；(使)横穿马路： It's so much safer to get across the road at the traffic lights. 在有交通红绿灯的地方横穿马路要安全得多。
2、(使)被了解；讲清楚，让…听懂： He taught me how to get my ideas across. 他教我如何把自己的观点表达清楚。【使。。。。理解】这个词组常用的。【get sth. across使。。理解】或者还有一种说法是【sth.get across to somebody】这个用法我觉得很难记住。我总是记不住呢
[英国口语]触犯，冒犯；使生气，使恼火： Take care not to get across the director,he could have you dismissed. 小心别惹经理生气，他会把你开除。 以上来源于：《21世纪大英汉词典》