Friends: inviting & declining

The usual routine between friends: inviting someone out, accepting, gently declining, and setting another time.

1. 今度こんどの日曜にちよう、暇ひま？

   Are you free this Sunday?

   「今度」 refers to the upcoming “this time/next time,” not “last time”; a plain-form question drops 「か」 and 「です」, relying entirely on the rising intonation at the end.

2. 一緒いっしょにカラオケ行いかない？

   Wanna go karaoke?

   「行かない？」 is literally a negative, but with a rising tone it reads as an invitation, “wanna go?” — the go-to sentence pattern friends use to invite each other out; in casual speech the particle in 「カラオケ（に）行く」 is often dropped.

3. いいね、行いく行いく！

   Sounds good, let's go, let's go!

   Saying the verb twice in a row is a colloquial way to agree readily, and it's only used with people you're very close to.

4. ごめん、その日ひはちょっと……。

   Sorry, that day's not so great for me...

   Saying just 「ちょっと...」 is already a complete refusal, no need to finish the reason; and when you hear this line, don't press the speaker for what the ちょっと was about.

5. また今度こんど誘さそって。

   Ask me again next time.

   Adding this line after declining helps keep the relationship intact; but when someone says 「また今度」 to you, it may just be a polite phrase, so don't take it seriously and chase them to set a date.

6. じゃあ、日曜にちようの十二時じゅうにじ、駅前えきまえで。

   So, Sunday at noon, in front of the station.

   Friends often leave the verb out entirely when making plans — 「駅前で（会おう）」 — a sentence that stops at 「で」 already counts as complete.

A complete invitation exchange: your first suggestion gets a polite no, you offer a different day, and the plan is on.

1. the one inviting

   ねえ、金曜きんようの夜よる、映画えいが見みに行いかない？

   Hey, want to go see a movie Friday night?

   「ねえ」 is a greeting friends use to open a conversation; with people you're not close with, switch to 「あの、すみません」.
2. The one being invited

   金曜きんようか……。ごめん、バイト入はいってて。

   Friday, huh... Sorry, I've got a shift that night.

   「入ってて」 is a contraction of 「入っていて」; the sentence stops at 「て」, and the reason is already fully conveyed — that's the norm in speech, not a sentence left unfinished.
3. the one inviting

   そっか。じゃあ、土曜どようは？

   Oh, I see. What about Saturday, then?

   そっか is the casual contraction of そうか, the lightest aizuchi (backchannel) between friends.
4. The one being invited

   土曜どようなら大丈夫だいじょうぶ。何なに見みるの？

   Saturday works for me. What are we watching?

   「なら」picks up on what the other person just said and means "if it's ..."; the sentence-final 「の？」 is a common way to ask a question in plain form.
5. the one inviting

   新あたらしいアニメ映画えいが。すごく面白おもしろいらしいよ。

   A new anime movie. I heard it's really good.

   「らしい」= 'apparently' or 'I heard' for info picked up from someone else; sentence-final 「よ」 adds new information the listener doesn't know.
6. The one being invited

   いいね。じゃ、時間じかん決きまったらLINEして。

   Nice. Then LINE me once the time's set.

   「〜して」 is the friendly version of the request 「してください」 with 「ください」 dropped; the particle in 「時間（が）決まったら」 is omitted as usual.