When do I use on/in/at?

On is for when we are physically touching something: dates, days, social media, devices, and transport (that we can stand up on).

“He is on television.”

“The wedding is on the 31st.”

“She is an influencer on Instagram.”

“I will see them on Saturday.”

“I am on the plane now.”

In is for when something is inside another thing. Or for transport that we have to sit down in (a car).

“My food is in the microwave.”

“She is in the car now.”

“There is ice in my drink.”

“I’m swimming in the pool now.”

“Don’t look in the bag.”

At is for a specific time or place. We also use it after an adjective.

“I’m good at English.”

“The meeting is at 3 pm.”

“His surgery is at the hospital.”

“I’m bad at remembering things.”

“I’m okay at reading.”

“He is on the plane now. He will be arriving on the 4th of June, yes, on the Monday. I’ve posted it on the socials (social media). Could you put it in the calendar?

It’s in his itinerary, in the documents I gave you. He will see you in two weeks.

Can you meet him at the airport? You’re good at organisation, thanks. The flight will arrive at 5 pm. I’ll see you at the conference.”