I don't understand "yo"! It's a pronoun, but you put it behind words to make them plural, so how do you know which one you have in a sentence?

When "yo" follows a subject or noun, it's a plural definite article.
example:
Ti moun yo - the children
kabann yo - the beds
fanm yo  - the women, the ladies
Kabann yo chè - the beds are expensive
fanm yo kontan - the ladies are happy.

When "yo" follows a verb, it's an object pronoun.
example:
gade yo - look at them
m renmen yo - I love them
li manje yo - he ate them

When "yo" comes before a verb, it's a subject pronoun.
example:
yo kontan - they are happy
yo pale anpil - they talk a lot
yo sezi - they are surprised

:) "yo" is also a possessive adjective when it follows a noun.

example:
kay yo a bèl - their house is beautiful
machin yo a twò chè - their car is too expensive
lekòl yo a piti - their school is small.

Sometimes it helps to look at it in the context of a sentence.

Find the meaning of yo in the following  2 sentences.

1. yo renmen machin yo anpil.

2. papa yo mouri.  Sa fè yo tris.
hope that answers your question.

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