1. The child sat alone, playing with his toys, his eyes filled with sadness.

2. The little girl walked home from school, her heart heavy with loneliness.

3. The boy lay on his bed, staring at the ceiling, feeling the weight of solitude.

4. Lonely, not mind, is a person, a habit and a time.

5. I've learned… That having a child fall asleep in your arms is one of the most peaceful feelings in the world.

这些句子都描绘了孩子孤独的场景和感受，希望对你有所帮助。