亲自 (qīn zì): cá nhân mình

The manager personally went to the airport to welcome the distinguished guests.

To ensure the success of the surgery, the expert personally performed the operation.

My mother was sick, so I personally cooked a bowl of noodles for her.

The principal personally presented the certificates to the graduates.

Because the problem was serious, he decided to handle it personally.

I am personally responsible for this project, so please rest assured.