Just to add... If you want to appear more formal and businesslike, then you talk more about the idea, and less about it being your idea. It seems that... It appears that... What's most important is... This idea would work best if... A possible suggestion would be... One idea is that... It's necessary to... It would be better (or best) if... It would be most advantageous if... It would be preferable to...

I THINK I believe that ... In my opinion ... I realize that ... I recognize that ... I assume that ... I consider this to be ... I am confident that ... I am certain that ... I am sure that ... I WANT I would like to ... I need to ... I hope to ... I wish to/for ... I desire ... I prefer ... Many of the answers I've provided come from a thesaurus. A thesaurus gives us synonyms (words that mean the same or almost the same as another word.) Using a thesaurus helps us to find other words that could be used instead of the word that we are using. You can see a good thesaurus at: http://dictionary.reference.com/

in one's opinion， I suggest that…

My point of view... My opinion about this issue...

you all are so nice to answer my question.when i express something i want to do,i just use the parses such as"i want to","i hope ","i think".So I feel it is necessary for me to make some changes in my expression. Thank you for your answers,.You all so nice!