The pattern ～てくる is also really useful way to express a change in state. I remember it being a confusing pattern when I first started studying Japanese, but I solved that problem by using it constantly (regardless of whether or not it was appropriate) because, let’s face it, shit be changing, yo. (Cue Tupac track.) Gradually I’ve narrowed down the appropriate usage conditions.

Here’s a quick example sentence: この2ヶ月間仕事が忙しくて大変だったけど、やっと落ち着いてきた。

The first clause sets the scene – work was busy and it sucked. But (there’s the fulcrum for the change) things have settled down (or so he thinks). The second clause shows how things have changed from the first clause. They have gone from an 落ち着いていない condition to an 落ち着いている condition. The きた, I feel, helps emphasize this transformation and the やっと impresses exactly how long the subject was waiting for the きた to くる so he could キター！

So the next question is what’s the difference between ～た and ～てきた? It’s pretty subtle. Another example. I got a birthday package from a friend in the US the other day. If my friend spoke Japanese I could say that it got here with a simple 荷物が届きましたよ. Just the basic way to say that the package was delivered. I could also say 届いてきたよ, which feels more urgent – as if my friend or I were awaiting the arrival of the package slightly more desperately. Maybe the package was delayed? Maybe there was a kitten inside?! Or maybe we were just waiting to compare the USPS with Japan Post. (Japan Post wins.) As in the example yesterday, the きた・くる seems to address a sort of mutual understanding that exists whereas the plain form of the verb is best for communicating brand new information.

〜なってきた・くる is another pattern that you can use to express how something changes. An example: 寒くなってきた. Like Monday, the timeframe feels more specific, as in 最近 or 今日 or 今週. And once it’s cold enough, (you can use Monday’s pattern to say…) 雪が降ってくる.

This week I’ll explore the glories of the pattern ～てくる。The eternal caveat: trying to get back to the core of How to Japonese, this week will be especially unfounded in textbook “learnin’.” I’m looking back through the fog of time, thousands of hours of study, and countless repetitions in an attempt to narrow down the “sense” that I’ve developed for this pattern and how I came to that sense. How I’ve gotten used to it, I guess. Hope it’s helpful.

For me, this pattern represents the earliest stages of getting used to it. Jay Rubin’s book Making Sense of Japanese is the Bible of “getting used to it.” I first read through it my sophomore year of college. Not all of it sank in immediately, but this pattern did. He has one short section titled “Go Jump in The Lake, But Be Sure to Come Back” where he calls 〜てくる an idiomatic expression; in English we say “go do,” and in Japanese they just happen to say “do and then come.” Get used to it.

The most basic ～てくる pattern is 行ってきます, which is what people say when leaving the house in Japan. When translating, it’s probably best to go with something like “I’ll be back” or “I’m stepping out” or even “See you later.” The expression literally breaks down to “I will go and then come (back)” but really only means “I’m going.”

That’s easy enough. You can extend this to any activity:
弁当（を）買ってきます。 I’m going to buy a bento. (Because I can’t be asked to make anything.)
一服してくるよ。　I’m taking a cigarette break/rest. (Because this office is hot as hell!)
まい泉でトンカツを食べてきた。 I went and had tonkatsu at Maisen. (Which is why I can’t get up from the couch.)
年末ジャンボを二枚買ってきた！ I bought two New Year’s Jumbo tickets! (And when I win I will retire at 28.)

The big question is what is the difference between plain, old 買いました and 買ってきました. The former conveys only the basic information – you bought something. The second one feels more like an event, one that the person being addressed was previously aware of – you went out and bought something that you had been talking about earlier. (You can see this implied information in parenthesis for the examples above.) And 買います and 買ってきます？ The former to me feels undefined in terms of timeframe, whereas the latter is going to happen sooner or at least in a more specified timeframe such as これから or 明日 or お金がたまったら.

I’m going to go ahead and say that you should be using this pattern 40% more often than you currently do. So go on. Get out there and go do some stuff. And come back when you’re done.