In English, an infinitive verb fufills the function of a noun and is formed with “to” and the verb “be” — thus, “to take,” “to laugh,” and “to be.”
You may have been warned (by stern but well-meaning eighth grade English teacher Sister Mary Knucklewhacker, or by fussy but thorough high school guidance counselor Mr. Nerdbody) that it’s bad form to “split an infinitive” by inserting a modifying word between “to” and “be”.
The following are examples of split infinitives: “to greedily take,” “to enthusiastically laugh,” “to finally be.”
More on split infinitives.
‘Star Trek’ Aim ‘To Boldly Go’ Approved by New Dictionary
“James T. Kirk was way ahead of his time in deciding ‘to boldly go’ into far-flung galaxies. The ‘Star Trek’ captain was out there splitting infinitives in his 1960s TV science-fiction series long before the ‘official’ green light was given. Now, in the New Oxford Dictionary of English (NODE), 30 editors and 60 consultants around the world have sided with Captain Kirk and given their blessing to what some grammatical sticklers still regard as anathema or worse.”