Indefinite Articles

In Spanish there are this many ways to say "A"?

• 1

• 2

• 3

• 4

How do I know which of the 2 ways to use?

• I guess.

• I flip a coin.

• I ask a friend.

• I match it to the noun I am talking about.

I need to use "un" if the noun I am talking about is ...

• masculine singular

• feminine singular

I need to use "una" if the noun I am talking about is ...

• masculine singular

• feminine singular

Words that are masculine usually end in the letter ...

• a

• o

• r

• s

Words that are feminine usually end in the letter ...

• a

• o

• r

• s

Which is the correct way to say "a ruler"?

• un regla

• una regla

Which is the correct way to say "a desk"?

• un escritorio

• una escritorio

Which is the correct way to say "a backpack"?

• un mochila

• una mochila

Which is the correct way to say "a book"?

• un libro

• una libro