Explanation
Expresses the idea that it's not entirely impossible or non-existent: 'It's not that I don't...', 'It's not that there aren't...'
Formation
Verb-negative form (ない form) + ものでもない
Detailed explanation
The grammar point Verbないものでもない is used to express that a situation is not completely impossible or nonexistent. Literally, it can be translated as 'it's not that there aren't...' or 'it's not that I never...'. It implies that some possibility or partial truth exists.
Examples
Ryokou ni ikitai to omowanai mono demo nai.
It's not that I never want to travel.
Kare no itta koto zenbu ga machigai nai mono demo nai.
It's not that everything he said is completely free from mistakes.
Sono mondai ga tokenai mono demo nai.
It's not that the problem can't be solved.
Kare ni aitakunai mono demo nai.
It's not that I don't want to see him.
Practice
Grammar content sourced from hanabira.org.