In my opinion(s)

0Are the phrases below considered as idiom and, therefore, all of them should be in singular forms even if there are multiple conclusions, opinions and etc?02br
02br
00For example(s)02br
00In conclusion(s)02br
00As a result (As results)02br
00As a conclusion (As conclusions)02br
00In my opinion(s)02br
00In summary(ies)0-