He shifted the topic.

My life has become busy recently.

He made up his mind to apply for a new job.

It's important to believe in yourself.

He changed the engine to improve the performance of the car.

My car needs to have its engine replaced.

The ventilation in this room is not good, so please open the window.

I opened the window to ventilate the room.

She uploaded a selfie to Instagram.

She took a selfie and uploaded the photo to social media.