Peterisswimming(cross)theriver.用cross还是across填空?cross和across的区别,请举例说明

Question

Peter is swimming _____(cross) the river.用cross还是across填空?cross和 across的区别,请举例说明

Answer 1

用across,句子的意思是Peter正横渡小河.across 在这里是介词,指从一边到另一边,后边跟名词the river.此外,句子中已有动词,由此也可判断只能选across.
cross 用作动词时,也有穿越、越过、横过、渡过的意思,如：
Watch out for cars when you cross the road.过马路时当心车辆.
It is safe to cross the river in this boat.坐这艘船过河很安全.
这两句中的cross均作动词用,和across的用法不一样.由于二者词性的不同,用法也就不同.