Answer:
1. Patricia tiene un regalo para Marta. (Patricia has a gift for Marta.) This use of para indicates that Patricia has a present for Martha.
2. La tarea es para mañana. (The homework is due tomorrow.) This use of para indicates that the homework is for tomorrow.
3. El avión va para Madrid. (The plane is going to Madrid.) This use of para indicates that the plane is going Madrid.
4. La cama es para dormir. (The bed is for sleeping.) This use of para indicates that the bed if for sleeping.