use of de end que.
The question is. when in the sentence I have to use the" DE" and when" QUE" what the legality with. thanks malka
2 Answers
Basically de means of or from for example: El libro de Juan The book of Juan ¿De dondé eres? Where are you from?
But de can express much more but those are the basics.
Que means what, who, that for example: ¿Qué pasado? What happened? ¿Qué tal? Whats up? or How are you?
El chico que se gusta chocolate. The boy who likes chocolate or also means The boy that likes chocolate.
There are lots of examples, expressions etc.
I suggest you do your own research 
it would be easier for you to understand, look for some grammar websites that could help you out:
www.studyspanish.com is very helpful
The preposition "de" is a bit like in English "of": you use it to express possession, amount, position, judgement,... e.g. libro de recetas (book of recipes), vaso de agua (glass of water). Like in English, certain verbs require a preposition after it, like "account for", "search for", "care for",... In Spanish, "acordarse de" (remember), "acordarse de",...
"Que" is used like "that" in English (although in English it can be suppressed quite often) in phrases like "He said that he was coming". There are other uses, but I won't list them all.
You get "de que" when you require a "de" as explained above, and it so happens that you require a "que" right after the preposition. They are not connected in any way.
