2013 Jun 13 01:21 AM UTC | English⁵ Grammar⁴ [2013]¹⁰

Some people are hypercritical and think to boldly go should be to go boldly or even the awkward boldly to go. However, the argument is that English should follow Latin’s rules, but it is impossible to split infinitives in Latin, as there is no infinitive marker in Latin, effectively making the argument invalid.

Also, wouldn’t the effect of some sentences be destroyed? There is no way to reword these without forming an awkward sentence:

I need you all to really pull your weight.

We are determined to completely and utterly eradicate the disease.

I expect him to completely and utterly fail.

We are seeking a plan to gradually, systematically, and economically relieve the burden.

We expect our output to more than double in a year.

I want to not see you anymore. (Well, maybe “I do not want to see you anymore”)

Source: “Split infinitive” from Wikipedia

Remember to, whenever you want, split infinitives. To, regardless of what some prescriptivists say, split an infinitive is perfectly valid.