"In to" should only be two words if it's part of a phrasal verb that ends with in (not into), like the phrase jump in.
When I ran into this question, I decided to jump in to answer it.
Another example: "turn in"
A) I turned my term report in to my teacher. - Correct
B) I turned my term report into my teacher. - Incorrect
In sentence A, it's clear that I submitted my term report to my teacher. In sentence B, it sounds like I got my term report to transform into my teacher!
Therefore, a knowledge of phrasal verbs is needed to decipher your question.
Other phrasal verbs to which this may apply: break in, butt in, cut in, get in, give in, go in, hand in, kick in, put in, pull in, rush in, write in, zoom in
For all the other verbs in the world, you can decide whether it's best to use either in or into, but usually not in to. I pour Orange Juice into my glass, not in to it. One exception of this is if "to" is part of its own verb infinitive (e.g. At the bank, he walked in to make(inf.) a deposit.). It's good to know if the "into" is followed a noun or a verb.
It depends on if your verb is part of a phrase ending with in. You can cut into a checkout line, and you can cut into a piece of paper with scissors, but if you "cut in to" something, chances are you are interrupting or butting in, not using scissors.
C) She came into the boutique. - Correct
D) She came in to the boutique. - Awkward
E) She came in to see what was on sale at the boutique. - Correct
Sentences C and E are correct. In sentence E, "came in" is a phrasal verb and "to see" is a verb infinitive. There is a space between them because they are separate parts, whereas in sentence C, "into" is just a preposition in its own right. I have seen sentences like D in casual writing, but I assume it's just the writer's mistake.
There is a type of puzzle named spot the difference
The main difference between the two products is their ingredients.
The difference between the two options refers to the distinctions or variations between the choices being compared.
The difference between "i" and "I" is that "I" is always capitalized when referring to oneself as a pronoun, while "i" is not capitalized.
irony
difference between as on and as at
What is the difference between Florida and California What is the difference between Florida and California
what's the difference between physician and doctorwhat's the difference between physician and doctor what's the difference between physician and doctor
Difference between paging and what?
The answer of difference
difference between enterprise and corporation
The difference between a shogun and a samurai is like the difference between a king and a knight.
difference between enterprise and corporation
Difference between it and what?
what is the main difference between polyethylene and polyesters what is the main difference between polyethylene and polyesters
The difference between Disneyland and Disneyworld is that Disneyland is in California and Florida is in Disneyworld. This is the difference between Disneyland and Disneyworld.
Directly. Their difference IS the difference between them.