Explanation
Express inability or impossibility of doing an action (often as a polite refusal).
Formation
Verb-ます stem + かねる
Detailed explanation
The ～かねる grammar point is used to express that someone cannot do an action or that something is impossible to do. It typically has a nuance of reluctance or polite refusal and is formed by adding かねる to the ます-stem of the verb.
Examples
Sono mondai wa muzukashii no de, watashi ni wa kaiketsu shi-kanemasu.
Since that problem is difficult, I cannot solve it.
Kare no itte iru koto ga shinjitsu ka dō ka handan shi-kanemasu.
I cannot judge whether what he is saying is true or not.
Kanojo ga kuru ka dō ka ima sugu ni wa wakari-kanemasu.
I cannot immediately know whether she will come or not.
Kuwashii naiyō ni tsuite wa setsumei shi-kanemasu.
I cannot explain the details.
Practice
Grammar content sourced from hanabira.org.