catch up和catch up with的区别
catch up
1.赶上
2.产生（预料到的坏影响）,造成（意料中的坏结果）
3.逮捕（某人）,发现（或查明）（以便处罚或逮捕）
例句：
1.must run some to catch up 必须快跑才能赶上
2.She couldn't go to school for a few weeks because of an illness,but she'll be able to catch up with her lessons quickly.她因病有几周不能上学,但是她很快就能补上落下的课.
3.He's doing extra work to catch up with the rest of the class.为了赶上班里的其他同学,他做了很多额外的功课.
4.After the exams,I need to catch up on my sleep.考完试以后,我要补觉.I need to catch up on laundry today.
catch up with
1.vt fus (walking,driving,in standard) 赶上
the law caught up with him yesterday 昨天警方发现他做了违法的事 his past caught up with him 他的过去阴影不散
例句：
1.She couldn't go to school for a few weeks because of an illness,but she'll be able to catch up with her lessons quickly.她因病有几周不能上学,但是她很快就能补上落下的课.
2.He's doing extra work to catch up with the rest of the class.为了赶上班里的其他同学,他做了很多额外的功课.
3.I can feel the pressure of the last few months beginning to catch up with me.我感到这几个月来的工作压力已经让我体力不支了.
4.I'll catch up with you again in a few minutes.几分钟以后我就会再次赶上你.
5.Can I catch up with the material or is it too late?我能再对材料做一下补充吗,是不是太晚了?
clutch是什么
clutch[英][klʌtʃ][美][klʌtʃ]vt.抓住; 抓紧; 紧握; 抓取; vi.试图抓住; 踩离合器; adj.紧要关头的; 没有手提带的; n.离合器; 紧抓; 控制; 紧要关头; .I staggered and had to clutch at a chair for support.我踉踉跄跄地，不得不抓住一把椅子稳住自己。
clutch有名词的意思吗
没有
clutch 英[klʌtʃ] 美[klʌtʃ]
vt. 抓住; 抓紧; 紧握; 抓取;
vi. 试图抓住; 踩离合器;
adj. 紧要关头的; 没有手提带的;
[例句]I staggered and had to clutch at a chair for support
我踉踉跄跄地，不得不抓住一把椅子稳住自己。
[其他] 第三人称单数：clutches 现在分词：clutching 过去式：clutched过去分词：clutched