Yes, but it often has a soft mutation, ddim.
Dw i ddim yn mwynhau yfed te.
I'm new at Welsh, (and enjoying it) but can someone tell me why you couldn't have put Megan before "diolch".... The question I had was "_ diolch" and choices were Dim and Megan. Since word order, for me, is all over the place having studied most Nordic and Germanic languages-- I'm only now starting with Celtic types... does word order insist that only Dim can precede words like diolch, (which I wonder if that's a generic "thanks"), or could it have been Megan, thanks? And Diolch in advance for any help!