1. The school girl in red is my sister.
2. The boy under the tree is my brother.
3. The students in the front of the classroom are from my class.
4. Playing football is my favourite.
5. To do homework first after school is my duty.
6. Those who help themselves can get help from God.
7. The boy, as well as his playmates, has gone there.
8. Her father, more than anyone else, loves her deeply.
9. The cat is sleeping on the sofa.
10. To learn a new language is a great challenge.
这些句子中的主语都是由名词或名词短语构成的，希望对你有所帮助。
