Here is a worksheet on differentiating the use of turn into and turn in to. Like the other 100 or so of these I will post or already have posted, the text for this document is excerpted from Paul Brians’ handy usage guide, which he has posted online in its entirety–under this link–Common Errors in English Usage.
This is an area of usage that it will serve students very well, in life and work, to know. The worksheet is scaffolded, with five modified cloze exercises, then a blank field on which students may try their hands at extemporaneously writing sentences using these two verb phrases–or phrasal verbs, really.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.