Unique rules when forming that grammar are highlighted like this
Example sentences follow these rules too!
Joining and Nesting Markers:
Verb[た/る] - means that dictionary form and ta form are accepted.
Verb[causative[て]] - means て form of the causative form of the verb.
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(A) てはかなわない is an old-fashioned expression used to indicate the displeasure of the speaker/writer with (A). こう and こんなに are often used when (A) is an adjective.
It is possible to use てかなわない、as in 寒くてかなわない. The difference between them is like the difference between て (It's unbearable because it is cold) and ては (It's unbearable when it is cold like this). The て is not used with こう and こんなに as often as ては. The latter also has a stronger nuance of displeasure.
てかなわない is in general NOT used with verbs, but as an example, if we used it here the difference would be: て (It is unbearable as it rains (now)) ては (It's unbearable if it rains)
It's unbearable when the people upstairs are noisy.
In this case てかなわない would mean that the person above is noisy right now, while てはかなわない would be more general, "If the person above is noisy, it is unbearable."