Explanation:
I went to Spain, I did many things during the trip. I ate tapas every day and try paella and a Spanish omelette. I visit many castles and I take many photos of everything. Upon returning home, to visit my family and to all of them how much I enjoyed.
Teclado
Unidad Central de Proceso (CPU, por sus siglas en ingles)
Monitor
Ratón (Mouse)
Disquetera (Floppy)
CD-ROM
I'm not very good on explaining this but I'll give you an example or more than one.
Antonio y yo nos besamos.
Antonio and I kissed each other.
¿Os conocéis?
Do you all know each other?
Juan y María se casaron.
Juan and Maria got married (to each other).
Los estudiantes se ayudan.
The students help each other.
I hope it helped
The singular form of los libros is el libro. The reason why we use el is because libro is masculine.