in charge
In charge (adjective) means having control of or responsibility for a group, situation or piece of work. Example: “Who is in charge while the manager is away?”
How to use in charge
Learner’s notesIn plain EnglishBeing the person who is responsible and makes the decisions.
Neutral; used equally in workplaces and everyday speech.
Note there is no article: say he is in charge, never he is in the charge, unless you mean he is being supervised.
Fill the gap
Can you complete this real example?
Who is _____ while the manager is away?