6
What should I consider when choosing between these phrases:
suffice to say
it suffices to say
suffice it to say
I don't know about the second and third one but I can speculate that the first one ("suffice to say") is not obsolete, at least in the USA. For instance, in an episode of the TV series, Dexter, there is a conversation that goes like this:
[Dexter]: Deb found out what I am. She knows everything.
[Dr. Vogel]: Everything? How?
[Dexter]: It's a long story. Just suffice to say she's not handling it well.
So, I assume in similar situations it would be safe to use the phrase "suffice to say", yet I don't know when I'd need to switch to another alternative (after all, I don't like to mess with the Mr. Potato Head!).
4
Google Ngrams is case sensitive, so if you want to match these phrases at the beginning of a sentence, you should capitalize the first letter of each n-gram. Look how different the results are when you do so: http://books.google.com/ngrams/graph?content=Suffice+it+to+say%2C+Suffice+to+say%2C+It+suffices+to+say&year_start=1800&year_end=2000&corpus=15&smoothing=0&share= Suffice it to say is the clear winner if you happen to be talking about the beginning of a sentence.
– snailplane – 2013-08-14T04:47:05.267-1 for "'It suffices to say' and 'suffice it to say' are the same, just with a word-order inversion for stylistic purposes". "Suffice it to say" is using the subjunctive: literally, it means roughly "Let it suffice to say". (Cf. "The king lives long" vs. "Long live the king".) The choice of subjunctive vs. indicative may be stylistic, but once that choice is made, the choice of word order is forced. – ruakh – 2013-08-18T18:52:14.977
Also, -1 for not fixing your answer after snailboat showed that it was wrong. If we plot capitalized and uncapitalized versions on the same graph, it's clear that "suffice it to say" has continuously been the most common variant for at least two hundred years. (N.B. I can only downvote you once, so this -1 is actually the same as the previous -1.)
– ruakh – 2013-08-18T18:54:00.843