と (to) — sensushi

Related patterns9

Similar

ば
と states an automatic consequence, and bars commands or requests after it. ば shades hypothetical, allowing them when its own part is a state (時間じかんがあれば来きてください).
限かぎり
と states a result that always follows, with no limit of its own (押おすと開あく). 限かぎり instead names the limit itself, "for as long as X holds" (生いきている限かぎり働はたらく).
ては
と states a consequence with no judgment on it at all (押おすと開あく). ては assumes the consequence is unwelcome, and rejects a happy result (×毎日まいにち走はしっては健康けんこうになる).

Lookalikes

Same meaning10

if; when

ばif — general, lawlike conditionattaches at
ば〜ほどthe more you do X, the more Y — two things rising togetherattaches at
ばいいit'd be good to do; you can just do — low-stakes adviceattaches at
場合ばあいin the case that; if — a scenario named as a conditionattaches at
限かぎりas long as; unless — marks the outer edge of what stays trueattaches at
ものならif only it were possible to; if you were to — disaster followsattaches at
ならif (that's the case); as for — picks up what was just saidattaches at
たらif; when; once — after the condition completesattaches at
たらいいit'd be good if you did — advice fit to this one caseattaches at
としたらsupposing that; if we assume — a hypothesis set up for argument's sakeattaches at

All examples9

whenever / when — an automatic or invariable consequence

このボタンを押おすと、切符きっぷが出でてきます。
kono botan o osu to, kippu ga dete kimasu.
A ticket comes out whenever you press this button. neutral
この窓まどを開あけると、風かぜがすごく入はいってくるよ。
kono mado o akeru to, kaze ga sugoku haitte kuru yo.
A ton of wind comes in whenever you open this window. casual
春はるになると、この辺へんは観光客かんこうきゃくだらけになるよ。
haru ni naru to, kono hen wa kankoukyaku darake ni naru yo.
Come spring, this area gets packed with tourists. casual
この道みちをまっすぐ歩あるいていると、右手みぎてに郵便局ゆうびんきょくが見みえます。
kono michi o massugu aruite iru to, migite ni yuubinkyoku ga miemasu.
The post office comes into view on your right while you're walking straight along this road. neutral

when — narrative discovery, did X and there was Y

ドアを開あけると、知しらない猫ねこが座すわっていた。
doa o akeru to, shiranai neko ga suwatte ita.
When I opened the door, an unfamiliar cat was sitting there. neutral
テレビを見みていると、急きゅうに停電ていでんした。
terebi o mite iru to, kyuu ni teiden shita.
I was watching television when the power suddenly went out. neutral
音楽おんがくを聞きいていると、いつのまにか外そとが暗くらくなってた。
ongaku o kiite iru to, itsunomanika soto ga kuraku natteta.
I was listening to music, and before I knew it it had gone dark outside. casual

did X, then went straight on to Y — past, never a plan

彼かれは私わたしの顔かおを見みると、何なにも言いわずに出でていった。
kare wa watashi no kao o miru to, nani mo iwazu ni dete itta.
The moment he saw my face, he walked out without a word. neutral
子こどもたちは玄関げんかんに入はいると、かばんを放ほうり出だして遊あそびに行いった。
kodomotachi wa genkan ni hairu to, kaban o houridashite asobi ni itta.
The children came in the door, dumped their bags and went straight out to play. neutral

How it's formed5

Notes

The second half can never be a plan or an order
(×大雪おおゆきが降ふると家いえにいよう); たら carries those. This と is
also inside ないといけない, so a clipped 行いかないと reads as obligation.