which is correct?

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I would like to know which is correct and why one of them are incorrect in below sentences(ⅰ and ⅱ, ⅲ and ⅳ). If both of them are correct in a different situation, tell me what situations can we use the word. And i also would like to know the difference between the sentenceⅴand ⅵ.

ⅰ: Can you tell me the way to the station? ⅱ :Can you teach me the way to the station?

ⅲ :I saw a movie yesterday. ⅳ :I watched a movie yesterday.

ⅴ :I think him genius. ⅵ :I think of him a genius.

I would appreciate your cooperation.