When something turns into something else it becomes that thing.
Examples of use:
1. The caterpillar turned into a chrysalis.
2. The handsome prince turned into a frog
If someone turns something into something else they change it into that thing.
Examples of use:
1. The property developers turned the big old house into four luxury apartments.
2. The empty factory was turned into a museum.
infinitive – turn into
present simple – turn into and turns into
-ing form – turning into
past simple – turned into
past participle – turned into