Workplace Prepositions: In, On, At, By, and Until: correct answers
Jump to answers ↓Digital Platforms, Devices, and Documents
When talking about where work happens online, choosing between in and on can feel like guessing. A helpful rule is to think about whether you are referring to a broad platform or an enclosed file.
Use on for digital platforms, software services, devices, and websites. Think of these as the "surfaces" where your work lives.
- You are on Slack, Teams, or Zoom.
- You work on mobile or desktop.
- You view data on a dashboard, a website, or a page.
Use in for specific digital containers, like files, folders, or distinct chat spaces.
- You type in a document, spreadsheet, or email.
- You send messages in a channel, a thread, or a DM (Direct Message).
- You use features in an app.
✅ I left a comment in the spreadsheet. ❌ I left a comment on the spreadsheet.
✅ The presentation is on the shared drive, but the link is in the Slack channel.
Meetings, Calls, and Work Status
Work events and statuses have their own specific prepositions that don't always follow a strict logical pattern, so it is best to memorize them as fixed phrases.
- Calls vs. Meetings: You are on a call (think of being on the telephone), but you are in a meeting (think of being inside a conference room).
- Specific Events: Use at for specific gatherings or locations, such as at the daily standup, at the conference, or at the office.
- Status: When you are away from work, you are on leave or on vacation.
✅ I would love to help, but I am currently on a call with the CEO. ❌ I would love to help, but I am currently in a call with the CEO.
Setting Deadlines: By vs. Until
One of the most common workplace mistakes is confusing by and until when talking about time and schedules.
Use by for a deadline. It means the action will happen at some point before or at that specific time, and then it is finished.
- Example: Submit the report by 3 pm. (You can submit it at 1 pm or 2 pm, but 3 pm is the absolute latest.)
Use until for a duration or an ongoing state. It means an action or situation will continue up to that specific time and then stop.
- Example: The servers will be down until Friday. (The servers are down the entire time from now up to Friday.)
✅ We need the final code by Friday so we can test it. ❌ We need the final code until Friday so we can test it.
Common Error: Learners often use until for deadlines. If you are asking a colleague to deliver a single task (like sending an email, finishing a presentation, or uploading a file), always use by. Only use until if the action is continuous, like being out of the office, waiting for a response, or leaving a system offline.
Correct answers
Question 1
If you desperately need the quarterly numbers, they are _________________________ the master spreadsheet.
You can also view our real-time panic metrics _________________________ the new analytics dashboard."
"I am currently on leave..."
We use the phrase on leave (or on vacation, on holiday) to describe someone's approved time away from work.
"...they are in the master spreadsheet."
We use in for documents, spreadsheets, and emails because we think of them as containers holding information.
"...on the new analytics dashboard."
We use on for digital surfaces, user interfaces, and screens, such as on a dashboard, on a website, or on a page.
Question 2
Help the busy employee complete their chat message by choosing the correct word.
I'd love to help you figure out why the printer is making that weird noise, but I'm currently ___ a Zoom call with the CEO!
The correct answer is on.
In digital workspaces, we say we are on a call (or on Zoom, Teams, the phone). However, if it's a meeting, we use "in" (e.g., "I am in a meeting").
Question 3
I looked for a link _________________________ the project channel, but I couldn't find one.
Should I just ask the manager _________________________ the morning standup?"
"Are we meeting on Zoom or Teams today?"
We use on for digital communication platforms and applications (on Zoom, on Teams, on Slack).
"I looked for a link in the project channel..."
We use in for specific digital spaces that contain messages or files, such as a channel, a thread, a DM, or an email.
"Should I just ask the manager at the morning standup?"
We use at for specific events or gatherings (at the standup, at the conference), though we say in a meeting or on a call.
Question 4
The correct answers are The new feature works perfectly on mobile, but you can also find it on the website. and Since Sarah is on leave, I will announce the updates at the daily standup.
We use on for devices and web surfaces (on mobile, on desktop, on the website), but in for specific applications (in the app).
For work statuses, we say someone is on leave. For specific types of quick meetings, we say we are at the standup.
Question 5
Select the correct word to complete the IT support message.
If you're looking for the new office Wi-Fi password, I posted it ___ the #announcements channel this morning.
The correct answer is in.
Think of channels, threads, DMs, documents, and emails as digital "containers"—so we put things in them! We use on for platforms or surfaces, like on Slack, on the dashboard, or on the website.
Question 6
The correct answers are We have until Friday to finish the data entry in the spreadsheet. and Please submit your final report by 3 pm so I can update the charts on the dashboard.
Use by for a deadline (a specific time an action must be completed) and until for a duration (how long an ongoing situation continues).
For digital documents, we write in a doc, in a spreadsheet, or in an email, but we display things on a dashboard or on a page.
Question 7
Choose the correct preposition to complete the project manager's friendly reminder.
Please make sure to upload the presentation to the shared drive ___ Friday, or the client will be very grumpy!
The correct answer is by.
We use by to talk about a deadline—a specific time when a single action (like uploading a file) must be completed. We use until for durations to describe how long a continuous situation lasts (e.g., "I will be on vacation until Friday").
Question 8
I will be offline _________________________ 3 pm today for a dentist appointment, so please don't call me.
We are planning to launch the new app feature _________________________ Q3."
"I need the final presentation slides by Friday at the absolute latest."
We use by to indicate a deadline (meaning "no later than").
"I will be offline until 3 pm today..."
We use until to describe a duration of time, showing how long a situation will continue before it stops.
"We are planning to launch the new app feature in Q3."
We use in for long periods of time, such as months, years, seasons, and business quarters (Q1, Q2, etc.).