1,My opinion is that~：我的意见是~
2,My suggestion is that~：我的建议是~
3,In my opinion that~：按我的看法~
4,As far as I know,：就我所了解的,
5,I think(这个是最简单的)我认为,I guess我想,I believe我相信
6,I hold the view that~：我坚持~观点
7,To my knowledge,据我所知,
8,You'd better~：你最好~