Examples of phrases that won't and shouldn't be used with the verb penso: Acho que você está errada! Acho que a gente devia ir na pizzaria em vez de fazer um churrasco. Acho que seria melhor se você colocasse isso desse lado! Acho = I think it would be better or worse if you do something differently! Eu penso em você todo o tempo. "acho" here won't do in any situation. I think on you all the time! Eu penso tanto em você que estou ficando paranóico. "Eu penso que seria melhor" this sounds like, 'camon man! of course you pensa!! after all, you are a human being 'n, afaIk, human beings are thoughful beings!! So, this is why you may choose "eu acho" rather than "eu penso" in many situations... And in many ways you are able to replace eu pensei by eu achei... and, to make things a lil bit worse, eu achei can have a total different meaning, like - I found the missing dog! ... and now I am realising how trick this is!!! xD I wrote so much and suddenly I found a formula xD.. if you can replace I think for I found, just use eu acho. If not, use eu penso xD And don't forget that sometimes "Eu pensei" will be preferable than "eu achei", specially when you're talking about impacting things, you'd rather use pensar than achar. Like: Eu pensei que você me amasse!!! I thought you loved me! Eu pensei que estava fazendo tudo certo, mas olha só onde fui parar ... I thought I was doing everthing right, but look where I am now ... Eu pensei que conseguiria, mas me dei mal... I thought I could do it, but I screwed up ! Note that here "eu pensei" is used for situations that have had a different ending from your expectation. And note that you could have used "eu achei" as well but "eu pensei" just sounds more hard-core. Eu pensei / Eu achei que ia chover, daí eu nem saí! Well, both are perfectly ok xD I thought it would rain, so I didnt go out. Very trick !!

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I think what was overloaded was my brain. The phrase is ok. I was reading it wrongly like if a sort of optical ilusion. Now, I "see" it clearly. Oh, my fault !