Being promoted changes which English you need. The vocabulary of doing your job well is not the vocabulary of directing other people's work, and the gap tends to show up in the first month — usually as a sense that you're being either too soft or too harsh with no idea which.
What changes
As an individual contributor you explain, report and ask. As a manager you delegate, set expectations, give feedback, decline things, and represent your team upwards.
All five of those are new registers. None of them appear in general English courses, and most appear in business English courses only as vocabulary lists.
Delegating without apologising
New second-language managers frequently over-soften instructions to the point where they stop being instructions.
I was wondering if maybe you'd have time to possibly look at the report at some point? — this is a question about availability. It is not a task assignment, and it will be treated accordingly.
Could you take the report and get it back to me by Thursday? is polite and is also unambiguous. The politeness is in could you and in the tone; it doesn't need four hedges on top.
Giving feedback
The failure mode is the compliment sandwich applied so thickly the message disappears. People leave the conversation feeling fine and change nothing.
A workable shape: name the specific thing, say what you need instead, check they're with you.
The client deck went out with last quarter's numbers. I need the figures checked against the source before anything external goes out. Does that work?
Specific, forward-looking, no character assessment. That's the register.
Saying no upward
Often the hardest for a new manager in a second language, because declining a senior person's request feels like it needs enormous softening.
What works is offering the trade rather than the refusal. We can take that on, but the migration would slip by two weeks — which would you rather? This is a normal, senior-sounding response, and it moves the decision to where it belongs.
Running a meeting
A different skill from attending one. You're managing time, bringing people in, and closing items.
Let's come back to that. · I want to hear from Priya on this. · So the action is — can we agree that? · We're running short, so let's take the last two offline.
Short, repeated phrases. Worth learning as a set, because a meeting you're chairing gives you no time to compose.
The authority question
Many second-language managers worry their English undermines their authority. In practice, authority comes across through clarity and brevity rather than range.
Short sentences, a clear ask, and comfort with pauses read as authoritative. Long qualified sentences read as uncertain regardless of how perfect the grammar is. That's an encouraging thing to know, because brevity is easier to learn than fluency.
Where it's worth practising
Delegation and feedback specifically, because they're the two you'll do weekly and the two where getting the register wrong has consequences you'll feel.