1. The sentence "I did not know that this food was meant only for the staff" is a complex sentence. The main clause is "I did not know" and the subordinate clause is "that this food was meant only for the staff."
2. The sentence "She is innocent, so she has appealed to the court" is a compound sentence. The main clauses are "She is innocent" and "she has appealed to the court."
3. The sentence "If you are not ready with the song, it is better to let them know" is a complex sentence. The main clause is "it is better to let them know" and the subordinate clause is "If you are not ready with the song."
4. The sentence "She will come home or I will stay back at her place" is a compound sentence. The main clauses are "She will come home" and "I will stay back at her place."
5. The sentence "In the evening, I am going to the park" is a simple sentence. There is only one clause, and it does not contain any subordination.
6. The sentence "The sun looks amazing today" is a simple sentence. There is only one clause, and it does not contain any subordination.
7. The sentence "I remember the day that we met very well" is a complex sentence. The main clause is "I remember the day very well" and the subordinate clause is "that we met."
8. The sentence "Nithi is not keeping well, yet she decided to go to work" is a compound sentence. The main clauses are "Nithi is not keeping well" and "she decided to go to work."
9. The sentence "After they reach the hotel, they will inform us" is a complex sentence. The main clause is "they will inform us" and the subordinate clause is "After they reach the hotel."
10. The sentence "We are going to the park" is a simple sentence. There is only one clause, and it does not contain any subordination.