副词为什么要在介词“to”和动词verb之间 split infinitive

Fabioqi

"It isquite common to come across a sentence like ‘Don’t forget to quickly call Mum.’In fact, most people would naturally choose this construction rather than amore awkward, and more ambiguous, alternative like ‘Don’t forget quickly tocall Mum.’ (Does the quickly refer to the calling or the forgetting?) Thiscomparison shows that, where the first type of rule is a genuine grammaticalrequirement, the second is a stylistic preference, which has no bearing uponthe real structure of the language."
From Horobin 2016 《How English became English》