jump的现在分词形式是jumping。
jump：
jump是个动词，其含义为“跳；跳跃；跳过；突然移动；猛涨；（数量或水平）突升，激增”，其第三人称单数是jumps，现在分词是jumping，过去式是jumped，过去分词是jumped。
jump the gun：
jump the gun的意思是“过早地行动，抢先行动”。其源于田径比赛。裁判打枪表示开始比赛，运动员如果在裁判表示开始之前就行动，他这样就是“抢先行动”了。因此，人们将这句习语引申为了如今的含义。
jump和leap的异同：
1、jump和leap都有“跳跃”的含义。
2、jump通常是指用双脚向上、向下跳，或跳到、跳过一定距离外的某一点。而leap更加侧重于身体猛力向上跃起并朝前急冲的动作。
jumping的例句：
1、The athlete was jumping over the high bar in the track and field competition，much to the amazement of the crowd.
那位运动员在田径比赛中越过高杠，令观众大为惊叹。
2、The children were jumping rope in the playground，counting each jump as they went along.
孩子们在操场上跳绳，一边数着跳的次数。
3、The acrobat was jumping onto a tightrope and balancing himself precariously above the audience's heads.
杂技演员跳上松紧绳，摇摇欲坠地站在观众头顶上方。
4、The dog was jumping up and down excitedly when its owner came home from work.
狗狗在主人下班回家时兴奋地上蹦下跳。
5、The skier was jumping off a ski jump at high speed，soaring through the air before landing safely on the ground.
滑雪者以高速从跳台上起跳，在空中翱翔后安全降落在地面上。
6、The frog was jumping from one lily pad to the next，enjoying the warm sunshine on its back.
青蛙跳着从一片荷叶上跳到另一片荷叶上，享受着暖洋洋的阳光。
7、The dancer was jumping and twirling on stage，impressing the judges with her agility and grace.
舞者在舞台上跳跃和旋转，以其敏捷和优美赢得了评委的好评。
8、The child was jumping up and down in excitement as she opened her birthday presents.
孩子们在打开生日礼物时兴奋地跳来跳去。
9、The horse was jumping over the hurdles in the equestrian competition，showing off its skill and strength.
马匹在马术比赛中飞跃着越过跨栏，展现其技巧和力量。
10、The bungee jumper was jumping off a tall bridge，freefalling through the air before bouncing back up on the bungee cord.
蹦极者从高高的桥上跳下，自由坠落在空中然后在绳索的弹力作用下反弹回来。