an wen VS an den mann, dem Hi every one Why this happened in these two sentence? in the first sentence we have "an den Mann, ..." but in the second one we have "an wen ..." and the other question is that is there any other situation in which we can make a Reletive Clause using "wer, wen, wem"? 1- Ich denke an den mann, dem du hilfst. 2- Ich weiß, an wen du denkst. Thank you in advence