Questions & Answers about Αυτό το βιβλίο έχει χιούμορ.
Because Greek normally uses a demonstrative + article + noun pattern.
So:
- αυτό = this
- το = the
- βιβλίο = book
Together, αυτό το βιβλίο means this book.
For an English speaker, the extra article can feel strange, because English says just this book, not this the book. But in Greek, this is the normal structure.
You will see the same pattern in other examples:
- αυτό το παιδί = this child
- αυτή η πόρτα = this door
- αυτό το σπίτι = this house
Αυτό is the neuter singular form of the demonstrative this.
It matches βιβλίο, which is a neuter singular noun.
The basic forms are:
- αυτός = this, for masculine nouns
- αυτή = this, for feminine nouns
- αυτό = this, for neuter nouns
Since βιβλίο is neuter, Greek uses αυτό.