13 of the most common grammatical errors that show people’s ignorance

8. 'Into' vs. 'In To': "Into" is a preposition that indicates movement or transformation, while "in to," as two separate words. Example: We drove the car into the lake.  Example: I turned my test in to the teacher.  In the latter example, if you wrote "into," you're implying you literally changed your test into your teacher.