It seems a truism to say
It seems now to be generally admitted
It should also be remembered that
It should be remembered
It so happens that
It was my good fortune
It was not so
It was under these circumstances
It were foolish to talk of
It were rash to say
It will be easy to cite
It will be found, in the second place,
It will be observed also that
It will be well to recall
It will not surely be objected
It would be misleading to say
It would be no less impracticable to
It would be vain to seek
It would do no good to repeat
It would seem that

Largely, I have no doubt, it is due
Let it be repeated
Let it be for an instant supposed
Let me add that
Let me ask who there is among us
Let me explain myself by saying
Let me illustrate
Let me instance in one thing only
Let me put the subject before you