You use attend when you go to a place or event. It means you are there with others, like at class or a party. This is a very common way to say you go somewhere.
I attend school every day.
She will attend the meeting tomorrow.
To attend means to give help or care to someone. It means to focus on a person or task to make sure it is done well. This meaning is common in hospitals or shops.
The nurse attends the sick patients.
He attends to customers in the store.
When you attend to something, you give your full attention. It means you listen or watch very carefully. This use shows focusing on details or sounds.
Please attend to what I say.
He attends carefully during lessons.
To attend someone means to go with them or help them personally. This is common when a person helps or supports another at special times.
She attends her father at the event.
He attended the guest during dinner.
This meaning is formal. It means something happens as a result or goes together with something else. It shows a connection between things.
Serious risks attend this decision.
Challenges attend every new job.
To attend school means to go as a student to classes. It is common and means to be part of education at a place regularly.
My sister attends university now.
They attend classes every morning.