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Questions & Answers about Abrid los libros.
Why does the word abrid end in a "d"?
Who exactly am I talking to when I use this form?
If I am only talking to one person, how do I tell them to open the book?
To give an affirmative command to just one person (tú), you use the same form as the normal he/she/it present tense. For abrir, that is abre. So, you would say Abre el libro.
I want to say "Open your books." Can I use los for "your"?
Yes! In Spanish, when the owner of the objects is obvious from the context (like a teacher telling students to open their books), it is very common to just use the definite article los (the) instead of a possessive word.