Grazie, faro' attenzione al senso "ingannare" :)

di solito dipende dagli animali (insetti) :) 叮 zanzara (succhiare il sangue) 蛰 ape e scorpione (lascere il veleno) (ti fa peggiore)

1. 我不舒服, 我想我感冒了.  ok  or 我不太舒服，我想我可能是感冒了。

2. 我不想他心里生气 I don’t think he is angry.  ---》 我觉得他不是在生气。 (I don't think sb does... in Chinese should be translated as "I think sb doesn't/isn't ...")

3. 这 趟 火车 开往西安 ok
4. 不要 ,要往中国 发 传真. ???????? 
5. 我 的 看法 跟 我 的 同事 是同的.   --》 我的看法和/跟我同事一样。
6. 今天他没有上班.我想他还有不舒服  --》 今天他没有上班，我猜他可能还是有点不舒服/我想他可能还是不舒服。
7. 他们 不习惯了,是很难习惯潮湿的天气  --》 他们很难习惯这种潮湿的气候。 （I think Climate is better than Weather when it comes to adaptability）
8. 要买一另好空调.  --> 要再另买一个好空调。
9. 我觉得学好韩语不容易, 很多时间需要学习.  --》 我觉得学好韩语不容易，需要花很多时间（学习）。
10- 因为他拉下她的手机. ？？？？？？？
11. 我想报告一个问题.    ok
12. 除了眼睛近视以外 ，他 的 身体没有 别的 问题 . ok
13. 那 位 小伙子住 在 我 隔壁.  --》 那个 （那位先生/小姐 ）
14. 他说话汉语很好, 但是他写不太好  --》 他汉语说得很好，但 书写/写字 不行。
15.我是在火车丢了我的行李。 （It's a emphatic sentence, if you're making a statement, you can say: 我在火车站丢了行李。）
16. 那个高个子姑娘正在和我的朋友聊天儿是 我的同学  --》那个正和我朋友聊天的高个子的姑娘是我的同学。
17. 昨天晚上我们去飞机上送行我们的老师 -》 昨天晚上，我们去机场送别我们的老师。
18. 因为其他的学生发现了不上课Because other students found out that class is canceled. --》 因为其他学生发现那节课(only one time that you don't have to attend the class)/那门课(the class  in a whole term is canceled) 被取消了。(maybe the in different part of China, different word are used to indicate "the class/lesson". Therefore, my words are a little different from the last replier.)
19. 如果 有 急事, 选择 坐 飞机. --> 如果有急事，选择乘坐飞机更快些。

（if you're learning the traditional Chinese, you can change the simplified examples with your softwares.） 活动 1. can be a Verb. Usaully, only in this circumstance: 在跑步之前，最好活动一下身体。 Before you start a running, you'd better move your body (limbs). Therefore, when it works as a verb, it is often used to indicate "to warm up" 2. as a adj., which means structures/parts of an object (usually not very big) are loose, not as firm as it initially was: 这个螺丝活动了。 This screw is loose. 3. as a None, which is the most common use, means "activities". 今年的活动包括读书会、讲座和研讨会。This year's event consisted of readings, lectures and workshops. 我们应当组织更多的社交活动。We ought to organize more social activities. Ciao

Generally, 相信 is followed by a conclusion that you think that is right or strongly believe. 1. 我相信你说的话。 I believe what you said (is true). (i'm confident in you)(can lead a Noun. structure) 2. 我相信你会拿到冠军的。 I believe that you'll get the title of the champion. (strongly believe) 3. 我相信地球上有外星人。 I believe that there are aliens on the Earth. (strongly think sth. is true) And 认为 is equivalent to think, followed by a complete or partly thought or opinion. 1. 我认为你说的是对的。 I think what you've said is true. ( anyway, 认为 should be followed by a complete sentence) 2. 我认为这道题应该选A。 I think for this question A is the right answer. (just a normal opinion ) 3. 我认为地球上有外星人。 I think there're aliens on the Earth. (just my opinion, compared to 相信有, the speaker is less of confidence) Hope this helps.