ていては
If someone keeps doing something or stays in a certain state, an undesirable result will follow. It is used to warn or criticize, implying the situation should change.
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Common in warnings, advice and criticism, from casual speech with よ to polite speech with ます. The main clause usually states a negative consequence, such as an inability (できない) or damage (壊してしまう). Compared with plain ては, the いる adds a sense of an ongoing or habitual situation.
Do not use this pattern when the result is desirable; the following clause should express something bad or unwanted.
Note that it implies continuation or habit, so it sounds odd with a clearly one-time action.
Learners should remember the main clause often ends in a negative form or てしまう, not a neutral statement.
- てはN2The conditional use of 「ては」 also anticipates an unfavorable result, but it does not emphasize continuation; it can also attach to adjectives and nouns, and it has a use for actions repeatedly alternating. When warning about an action or state that is currently continuing, 「ていては」 is the more fitting choice.
- ようではN2「ようでは」 can attach to verbs in various plain forms, adjectives, and nouns, and focuses on the speaker's dissatisfaction with the state or degree of the preceding item, which may also be hypothetical; 「ていては」 attaches only to the て-form of verbs and emphasizes continuation. When the preceding item is a continuing action, the two are often interchangeable.
- てはならないN2「てはならない」 expresses prohibition, meaning "must not...", and is used in rules forbidding something or in moral admonition, with a formal written tone; 「ていては」 is followed by a result clause indicating that continuing as-is will lead to a bad outcome, with a neutral register. The two cannot be interchanged.
- てはいられないN2「てはいられない」 is mostly used at the end of a sentence and expresses that, because circumstances are urgent or one's feelings are impatient, one can no longer go on as before, conveying anxiety or resolve; 「ていては」 is a conditional clause followed by the bad result that continuing would cause. The two cannot be interchanged.
- ばそれまでだN1「ばそれまでだ」 is used at the end of a sentence and means that once a certain thing happens, previous efforts are wasted, or that once that is said, the matter ends there; 「ていては」 is a conditional clause predicting a bad outcome if things continue as they are. The two cannot be interchanged.
ては is a broader "if X, then (bad) Y" conditional, and ていては stresses a continuing situation. ようでは criticizes someone for being in such a state, てはならない is a prohibition, and てはいられない means one cannot afford to keep doing something. ばそれまでだ means that if X happens, everything is over.
