Is "of" necessary in "thought of"? Could you give some examples with just "thought" (no "of")?
Yes, in this context, the "of" is necessary to have. To "think of" something means to remember, visualize, or bring something to mind. Ex: I can't think of anything else that I need to do. Ex: Sometimes I think of my childhood and wish I could go back. To "think" is used simply as a verb to express an opinion or a belief. In this case you are directly using your mind in the present, where "think of" implies that you are remembering something from the past. Ex: I don't think you are right. Ex: I think I am going to go to bed now.
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