What Does Desu Yo Mean?

It is used to emphasise a point. Unlike a lot of Japanese where usage is littered with probably, maybe, but etc, this is a stronger declaration of a point. In English it is something like "I tell you".

How do you use Desune?

"desu ne" is a meaningless, yet full of meaning, phrase. Following an adjective, such as "ii" or "kirei", it is seeking the agreement of the listener...but depending on the tone of voice, it can either be asking for agreement or presuming agreement: きれいです。 It's pretty.

What is the difference between desu and desu yo?

Essentially, ne asks for agreement or confirmation. This sentence ender is used frequently when making observations, as in “Ii o-tenki desu ne?” which you learned earlier. ... The final sentence ending particle, よ “yo”, is essentially the opposite of ne, it asserts a fact that the listener may not know. おいしいですね。