to tell (you) the truth

strange to say

to be sure

to begin with

to make matters worse

There is no -ing

cannot help-ing

be worth-ing

be used [accustomed] to-ing

look forward to -ing

never.... without-ing

It is no use-ing

Would you mind -ing?

feel like-ing

It goes without saying that ~

on -ing

of one's own -ing

prevent [keep, stop] A from -ing

frankly speaking

generally speaking

speaking [talking] of

judging from