The next time your English teach tells you not to split your infinitive, by all means, point them to “On the Separation, by Word or Words, of To and the Infinitive Mood,” The American Journal of Philology Vol. 3(1882): 17-22.

English has allowed split infinitives apparently since the 1450’s – and indeed a number of infinitives – “to fulfill” developed from a split infinitive: “to fully fill.”