The initial idioms of the letter I

If ifs and ands were pots and pans	if I'm honest
If it ain’t broke, fix it till it is	If it ain’t broke don’t fix it
if it ain't broke, don't fix it	if it ain't broke don't fix it
If it ain't chickens, it's feathers	if it comes to the crunch
If it looks like a duck and walks etc. like a duck	If it was a snake it woulda bit you
if it weren't for	if it's all the same
It's one thing after another!	if I've told you once, I've told you a tho
if knows what's good for	If looks could kill
if memory serves	if (one's) life depended on it
if my memory serves me correctly	if need be
if needs be	if not
if nothing else	if one’s a day
if one knows what’s good for one	if one knows what's good for one
if only	if pigs had wings
if pigs had wings, they would/could fly	if push comes to shove