as far as i know 据我说知
to the best of my knowledge 据我说知
to my mind 我认为
as for 至于- - - -
as far as i am concerned 对我来说
believe it or not 信不信由你
last but not least 最后
when it comes to (doing) sth.== speaking of
while i admit---- -- -,i must say-- - -.
rain or shine
considering- - - -
judging from / by -- - -