Sentence examples for I'm going in from inspiring English sources

The part of a sentence "I'm going in" is correct and can be used in written English
It is a common phrase used to indicate that one is entering a place or situation. Example: "I'm going in now," she said as she walked towards the door. The phrase can also be used in a figurative sense, such as: "I'm going in for my big presentation tomorrow." In this case, it means that the speaker is mentally preparing for the presentation.