1. ～とあれば
Explanation: Means “if it is indeed / if the circumstances are such that...”. The first clause presents a special condition or circumstance, and the second gives a judgment, action, intention, determination, or natural consequence based on it.
✓ It is often used when the condition in the first clause is sufficiently special or important to justify what follows.
2. ～たら最後 / ～たが最後
Explanation: Indicates that once the event in the first clause occurs, the state or consequence in the second clause follows and is difficult to stop or change.
✓ The consequence is usually undesirable, negative, or beyond control. It can be used for actual events or hypothetical situations.
3. ～ようでは
* Na-adjective だ -> な / である
* Noun N だ -> である
Explanation: Presents a state, behavior, or level that the speaker judges to be inadequate or undesirable, followed by the judgment that if things remain that way, the desired result is unlikely to be achieved.
✓ It often carries a critical, concerned, or warning tone.
4. ～なしに(は) / ～なしでは / ～なくして(は)
Vる (dictionary form) + こと + なしに（は） / なしでは / なくして（は）
Explanation: ～なしに means “without A / without doing A...”. With ～なしには / ～なしでは / ～なくしては, A is treated as a necessary condition: without A, B is difficult or impossible to achieve.
✓ With the forms containing は or では, the following clause is typically negative or expresses impossibility, such as “cannot,” “will not succeed,” or “cannot exist.”
5. ～くらいなら
Explanation: Used when the speaker regards the first-clause action as undesirable and presents another choice in the second clause: “if I have to A, I would rather B.”
✓ B may not be ideal either, but is judged preferable to A. The construction often conveys dislike of or a wish to avoid A, with strength depending on context.
