My dream is to travel the world.

When he was young, he was wandering around the world.

He is wandering around the world.

At that time, I was still a student.

Lately, the weather has been getting better.

At that time, he was still a student.

He was recalling fondly the summer vacations of his childhood.

He is still young.

He is still young, and looking forward to his future life.

He is still young, so he needs to learn a lot of things.