The phrase "not only sometimes" is grammatically correct and can be used in written English.
It is typically used to emphasize that something happens occasionally or irregularly. Example: "Not only sometimes does John forget his keys, but he also forgets his phone on a regular basis."
Defining oneself in a negative sense is not only sometimes convenient in politics, it is also devastatingly true.
The resulting GPR findings offer a fresh perspective on this important archeological site, while indicating that conservative antenna selection is not only sometimes warranted, but may be crucial in some archeological GPR investigations.
The outcome of a survey of some 29,760 high school students by these fucking geniuses revealed that kids not only sometimes steal from shops, but even lie to their parents about serious issues and cheat in school tests!
But it's not only celebrities; sometimes it just makes good business sense.
The insurers consider residential treatments not only costly — sometimes reaching more than $1,000 a day — but unproven and more akin to education than to medicine.
Such half-memories involve illusions, but this campaign climax has produced an atmosphere that is not only heady, sometimes dizzying, but clarifying too.
The deal highlights not only that sometimes experts make "mistakes" that lesser players wouldn't even consider, but also that top players can find good plays that the weaker brethren would overlook.
It also portrays a tight yet nuanced relationship between the Taliban and their Pakistani patrons, one not only of sometimes servile dependence, but also of frank enmity, and it says that the Taliban have gradually distanced themselves from Al Qaeda.
But I was transferring to Brown, where I would encounter not only trendy, sometimes inscrutable semiotics classes, but also coed floors, with men loping bare-chested to the bathroom at dawn to treat everyone to the birdsong of their powerful urination.
Not only that, sometimes the poachers would let you arrive at the address, only to not show up at all.
And how do you tell them that sometimes, like in my case, divorce is not only okay but sometimes necessary?
