"我认为...." 正式一点的英语怎么说

as far as i am concerned
in my view of point
I hold the notion that
in my opion
I deem/think/believe/maintain/reckon/argue/assume
I hold/share the opinion/belief/position/standpoint/notion/idea that..
My viewpoint/belief/opinion/notion is that......
自己积累的..多多交流
飘走了~`~~~

IN MY OPINION
As far as I am concerned

In my consideration,
in my opinion,

I think
I consider
I suggest/felt/suppose/assume

I think ....

I think`~~~啊