tashika kanojo wa raishuu ryokou no hazu da yo.

If I remember right, she should be traveling next week.

Breakdown of tashika kanojo wa raishuu ryokou no hazu da yo.

• は: topic particle
• の: possessive case particle
• 旅りょ行こう: trip
• だ: to be
• 彼女かのじょ: she
• 来週らいしゅう: next week
• はず: expected; supposed to
• たしか: if I remember correctly
• よ: emphasis

Questions & Answers about tashika kanojo wa raishuu ryokou no hazu da yo.

What does the word たしか mean here? Is it the same as たしかに or たぶん?

• たしか: “If I remember correctly / I’m fairly sure (based on memory).”
• たしかに: “Certainly / indeed” (confident affirmation).
• たぶん: “Probably” (a guess about likelihood; often with でしょう/だろう). They’re not interchangeable: たしか marks uncertain recollection; たしかに strongly affirms; たぶん states probability.

Why is there no particle after 来週? Should it be 来週に?

• Time words often omit に: 来週旅行… is perfectly natural.
• 来週に is also correct and can sound a bit more fixed/specific or formal.
• Many time expressions (今日、明日、毎日) normally don’t take に.

What is the の before はず doing? Why not 旅行だはず?

• With はず, the form before it is:
  • Verb (plain): 行くはずだ
  • i-adjective: 高いはずだ
  • na-adjective: 静かなはずだ
  • Noun: 学生／旅行のはずだ
• Do not say noun + だはず. Use noun + のはず.
• Past expectation: noun + だったはずだ is fine (e.g., 学生だったはずだ).

What nuance does はずだ add?

• はずだ = “is expected to / should (logically)” based on some evidence, memory, or reasoning.
• It’s fairly confident but not 100% certain.
• It is not the moral “should” (for that, use べきだ).

How is はずだ different from 予定だ or ことになっている?

• はずだ: speaker’s expectation/deduction.
• 予定だ: someone’s plan/schedule.
• ことになっている: an arrangement/official schedule or rule set by others or by the system. Example: 彼女は来週旅行の予定だ (planned), 彼女は来週旅行することになっている (is scheduled), 彼女は来週旅行のはずだ (I expect).

There’s no verb like 行く. Is 旅行のはずだ natural? What are alternatives?

• It’s natural: a noun + copula predicate works fine in Japanese.
• Alternatives:
  • 旅行に行くはずだ (very idiomatic “is expected to go on a trip”).
  • 旅行するはずだ (uses the verb “travel”; also fine).

Does 彼女 mean “she” or “girlfriend” here?

• 彼女 can mean either “she” or “(my) girlfriend.” Without context, “she” is the default.
• To avoid ambiguity, use the person’s name or drop it if context is clear.

What does the sentence-ending よ add? Does it clash with たしか? What about ね or よね?

• よ presents information assertively or helpfully to the listener.
• ね seeks agreement/confirmation; よね both informs and invites agreement.
• たしか … よ is fine: you’re being helpful while signaling slight uncertainty. For a check/confirmation vibe, use …はずだよね？ or …だったっけ？

Why use は after 彼女 instead of が?

• 彼女は sets “her” as the topic (most natural here).
• 彼女が emphasizes who it is (contrast/answer to “who?”). Example: 誰が来週旅行のはず？ → 彼女が来週旅行のはずだ.

How would I say this more politely?

• Swap だ for です: たしか、彼女は来週旅行のはずです。
• Softer/hedged: …はずでしょう or …はずだと思います／…かと思います。
• You can keep よ in polite speech: ですよ.

How do I change tense or make it negative with はず?

• Past expectation: …のはずだった (it was supposed to…).
• Negative expectation: …のはずじゃない (isn’t supposed to…).
• Strong denial: …のはずがない (there’s no way…).
• “Supposed to but didn’t”: …のはずだったのに…

Where can I put たしか, and should I write it in kanji?

• Placement: often sentence-initial or right before the uncertain bit (たしか、彼女は… / 彼女は、たしか来週、…).
• Writing: when it means “if I remember correctly,” many prefer kana たしか; 確か is also acceptable. For “certainly,” use 確かに.
• Normal Japanese writing doesn’t use spaces; a comma after たしか is common (たしか、… ).