You seemed troubled the past few days. > It is the past tense . Just like " You seemed happy the past few days ". You used the past tense of "seems" to mean that he looked like that to you sometime in the past . Example : Why did he not go to the party ? He seemed so keen to go when I met him the last time. Troubled (adjective) = having troubles He seems (so) troubled these days > Present tense > look troubled to you now

It's not a present perfect sentence. "Troubled" is an adjective in this sentence. We can tell by the word order.