How straight can you write on a plain paper...without any lines..???  

not very staright but it would be alright i suppose.

I don't write very straight at all on plain paper. If I use plain paper to write I usually always have a line of some type under it so I can try to keep it straight as I write otherwise my words would come out very, very crooked. It always amazes me to see people write straight on anything plain. Sometimes even the simplest things can amuse us.

I can write neatly and it's really straight. I don't need lines to make my handwriting or paper work neat and tidy. I've been used to do this since I was a kid and I always have neat and good paper works.

hahaha i'm writing notes now on a piece of blank paper and it's not very straight. @.@ so i kept wishing i had one of those sketching thingy that children use that give off a light so you can see the lined paper underneath.