In my opinion I (don't)think ~ .

私の意見では〜だと思います。



it would be wise to get some professional advice
you're over reacting
this is a problem, but rather an opportunity
it's time we called it quits
this problem is more serious than we realize
it's more appropriate to tell our customers the problem
it's better to tell them the truth
it's wrong not to tell him the truth
we should let him go
you'd better get help