Hi, Beth! Among them, 认为and觉得are the most common words to say 'think' in Chinese. It's just that 认为 is more formal and cultivated than觉得.觉得is often used orally. I think knowing these two expressions is quite adequate for your daily language use when it comes to 'I think, I believe, I guess, I suppose...', both spoken and written. 以为can be translated as 'thought' actually. e.g. I thought you were coming, but you didn't.我以为你会来.但是却没有. 我以为你不来了. It means that you thought the person wouldn't come, but he did come. e.g.我以为Beth是美国人,其实她是英国人. 想is a rather too commonly used verb, which has many meanings. To name a few: think, suppose, remember, reckon, figure out, desire, and even 'would love to'. It could be one of the most commonly used verbs in Chinese, too huge a topic, so I really suggest you looking this verb up in a dictionary for your own better understanding. For example, from my dictionary, a very big one, 想takes up an entire page, front and back! What can I say? Words like 想 in Chinese could be very reproductive. It's like the origin where many thinking words came from. 看as a verb basically means look, watch, and read, images you receive with eyes. However some phrases like在我看来has something to do with thinking, which can be directly translated as 'from my eyes, from my point of view, as far as I'm concerned, etc'. So, it is not advisable to regard '看' as 'think', because iIt could be confusing somtimes. 思考is to ponder, a kind of deep thinking, like meditation, thinking about very intricate things. e.g. 王教授正在思考. 想像, the word for 'imagine, or imagination' in Chinese. I don't think this word needs too much explanation. 设法is not think actually, it means 'manage to do, try to do'. I think the expression of 设法is very similar to the English one of 'make efforts to', because 设here means 'set up'----make, and 法means 'methods, ways, approches'----efforts. Clearer now? Hope it helps :)

想：It is the most basic moves. 想 It includes 认为，以为，思考，想象，觉得，设法and so on . But 看 is not ！ “ think ，suppose，wish，want... ..." They all belong to 想 。Is mainly the idea of heart and brain . 认为：It is used to your point of view . For example ，(1) I think I was right .我认为我是对的。 (2) I think I can complete the job.我认为我可以完成这个工作。 以为： It is like 认为，But you are not sure your views are correct . Usually happens after I knew I made a mistake. For example ,(1) I thought he was a student, but he is not!我以为他是学生，原来他不是！ (2) I think it will rain today 我以为今天下雨。 思考：to think over; to ponder on; to reflect on; to deliberate . (Reasoning 、judge and )Analysis of one or more objects . For example ：(1) I was pondering a question我在思考着一个问题。 (2) For a scientist, the thinking is very important.对于一个科学家来说，思考是很重要的。 想象：Imagine . Imagination(想象) and fantasy(幻想) is very similar .Imagination is a reality-based. But fantasy is not ! For example , Imagine that they play a couple.想像一下，他们会扮演一对夫妇 觉得：Like 认为。 设法：It means that no stone unturned . For example , In order to get the money, he tried all ways.他设法得到那笔钱 or (他为了得到那笔钱,想尽了一切办法。) 看：Look 。see. 看and 想was not the same. Look at things with the eyes. For example , (1)Please look at me. (2)Look at the blackboard. (3)Did you see me? (4)Lily saw a mouse ran to the kitchen . Lily看见一只老鼠跑进厨房。 NOTICE: 看法=观点 （Both are the views of meaning.） In china , A word can have different interpretations. You are so interested in Chinese ,I I think you are great ! I wish you success! (*^__^*) 呵呵……

hi, in oral you can say 我认为，我想，我看，我觉得 to express "i think" they all ok. 我以为=i thought eg. 我以为你已经把灯关了，原来你也忘了。i thought u turned off the lamp... 思考 verb usually it's a condition, means think ,thinking,think about. If after Personal Pronouns,should add a Prep. ahead of it. eg. 他在思考。我在思考。i am /he is thinking. 我要思考一下。 but no one will say"我思考这事该怎么办"，he may say"我在思考这事怎么办" 想象 imagine 设法 try to,manage to...

认为：Think something and get a result that you could feeling it very right. 想:Think something. [oral] 思考:Think something ,do one's best . [not a oral] 看: 1:look. 2: to observe something from appearance and could get some result maybe. judge it by subjective Eg: 我看这事儿没那么简单 以为：Think something but you known you get a wrong result. Eg:我以为今天会下雪，但是今天却下雨。 想象：U do not see something. but someone descript to u . so, u cuold "想象" that. 觉得：to observe something and could get some result maybe. judge it by subjective Eg: 我觉得这事儿没那么简单 。

Learning Chinese must read more and write more, you must catch the feeling of Chinese writing.