"special sign" are essential in Arabic , because it may differ a word from another , for example ragol.........رجل means man and regl ..........رجل means leg , they have the same letters but their pronounce is different , and so are their signs. it also differs the position of the word in the sentence , if you changed the sign of the last letter you may change the subject to object and change the whole meaning. so take your time when you read quran to read it without changing the meanings , and as solomon said you will be rewarded twice because you are trying to do your best , good luck.

our prophet 'sala ALLAH alyh wa salam' said : " whoever recites Quran and is good at it is with angels in heavens and whoever recites it with difficulty will be rewarded twice" قال رسول الله صلى الله عليه وسلم :(( الذي يقرأ القرآن وهو ماهر به مع السفرة الكرام البررة ، والذي يقرأ القرآن ويتعتع فيه وهو عليه شاق له أجران )) .

this is impossible because the signs like( kasra, fatha, tanween) are like the vowels in English. We - Arabs- can not communicate without using the signs, even in our conversation.

no we can not