I was taught that the infinitive particle "to" cannot be separated from the verb under no circumstances, but my friend (a Canadian) told me that she would prefer "I try to never tell a lie" over "I try never to tell a lie". Is it correct to squeeze anything in the middle?
English has a scheme where it uses certain words in front of verbs to modify the meaning of the verb:
Infinitive - to X.
Form of have to express perfect aspect - have/has/had X'ed
Form of do for emphatic/do-support - do/does/did X
Modals - would/should/could/may/might/ought/shall/will X
Form of be for passive or progressive - am/are/is/was/were X'ed/X'ing
Adverbs for X can come between those words and X.
to really go, have really gone, did really go, would really go, is really built.
Two adverbs with one of the above words in between is possible as well.
I want it to certainly have completely gone away by the time I get back.