have effect in sth 能加S

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• 一片英语科技短文的选择here have been many great inventions, things that changed the way we live in. The first great invention was one that is still very important today一the wheel. This made it easier to carry heavy things and to travel long distances. For hundreds of years after that there were few inventions that had as much effect as the wheel. Then in the early 1800's the world started to change. There was little unknown land left in the world. People did not
• Let's go and have a drink.让我们去喝点东西吧.让我们去喝点东西吧.Let's go and have a drink.我写的是：Let's go and drink some thing.能这样写吗?
• 英语：be away from get back to sp come back to sp return to sp by the lake leave sp leave for sp leave sth at/in I have a toothache（该同义句） -------------------------------------------------- How many teachers are there in your school?About two __________________________数学：小明在公路上行走 速度是每小时6km 一辆车身长20m的汽车从背后驶来 并从小明身旁驶过 驶过小明身旁的时间为1.5s 则汽车的速度是?（写出过程及说明道理）
• 什么时候用have 什么时候用has 什么时候动词要加s.能举例说明么?
• 有些大专英语作业需要解答,全答对给100三、阅读理解（共 2 道试题,共 40 分.）V1.When I begin to look back on all friends whom I have had,I quickly came to the conclusion that Jerry was the most important and had the greatest effect upon my life.His family moved to my block when I was only 10.Jerry was 15 at the time,but the fact that he was so much older than me seemed to make no difference to him.I was very glad that he liked me.We took long walks together,on which he would tell me s
• have effect in sth 能加S
• do you have a sport collection请问collection是什么意思、这里的sport要不要加s
• I have nothing to do but read 这里的read是原型还是过去式,but后加什么?能加过去式吗
• It's always difficult being in a foreign country,especially if you don't know the culture of thecountry.请问being 什么成分,什么用法,我真不理解我在网上查了很多，没有it's difficult doing sth，只有 have difficult in doing sth,请问到底该怎么正确理解,有it's no use doing,no good doing等等
• You need to have healthy eating habits这里的habit后面为什么要加s
• Who's the boy?The tall man under the tree.
• the man is my father.he is reading a newspaper.The man is my father.He is reading a newspaper.(合并成定语从句）,