The initial idioms of the letter I

is it just me	is killing
Is my face red!	be no mean feat
be no quarter given	is not a bed of roses
be out of pocket	That's putting it mildly
is rotten in Denmark	sit tall in the/(one's) saddle
supposed to	is that a fact
Is that so?	is that a fact?
Is the glass half empty or half full?	Is the pope a Catholic?
is the pope Catholic	Is there?
Is there any truth to?	anything else?
Where can I wash up?	is
isn	isolate from
issue	issue a call for
issue as	issue from
issue from some place	issue to