<p>In a recent mock SAT test that I took, in the identify the underlined error in the sentence part of the writing section, there were two questions I was unsure about. </p>
<p>One of them started with Presumed that it was(all underlined) dead, bla bla bla. I was wondering whether "Presumed that it was" is an idiomatic error, because it would be way more concise to say Presumed to be or just Presumed dead?</p>
<p>Another one was, As technology becomes more pervasive, humans lose sight of the fact that tasks which are now trivial to accomplish just a decade a go would seem(underlined) impossible. I don't remember any other parts underlined in this sentence, but "would seem" stood out to me. Should "would seem" have been " would have seemed"?</p>