"ist das dein" basically means "is this yours"
Das ist = That is.
"That is not" is "das ist nicht" in English.
Wie ist dein Vater = How is your father
"What is this?"="Was ist das?" (if it`s meant as a question).
where is your husband
Was ist das = what ist that
"Das ist gut" means "This (or it) is good." in English. It's basically said to show approval of something, or agreement.
"Vas is das" is not a correct phrase in any language. It may be a mix of German and English, where "was ist das" in German means "what is that" in English.
It means what is your favourite subject.
Translated from the German, it means "how much is that?", implying usually, "how much does that cost?"
Translated from the German, it means "that is outstanding".
das ist literally translates to 'that is' you woudl not use it on its own but in a sentance. i.e. Das ist super! That ist super! or Das ist mein hund. That is my dog