K....so I am coming from the kinder world but this was how we transitioned over the year (of course you will be able to adapt for those "bigger" kids:)
We started at the beginning of the year distinguishing "baby talk" and "college talk". Baby talk is a short answer, "college talk" is where the question is in the answer. Then we went to "College Graduate" talk, because college graduates have to back up their answers by telling why they think what they think. So the kinders went to answering the question with the question in the answer and then adding "because" and explaining their thinking. Of course when they got good at that I wanted them to tell me more so we added the adder word "and". Now my kinders are "geniuses" (and they will remind you that, should you forget...

) and they can give their answers with the question in the answer and 3 supporting details. Now concluder was a new concept just handed on down to us~ and so we are working on that, but I would say that after all they have accomplished it should be a piece of cake. Here is an example of their progression based on some answers given to me last week:
We are studying habitats (this is a signal word and everytime I say it the students say "A habitat is where animals live" while doing corresponding gestures). I showed a picture of a habitat and I asked the students what habitat they thought it was and to support their answer with details from the picture. Here is what the student said:
"I think this is a picture of a desert habitat because first of all, it looks very hot. Second of all, it looks very dry and there is no water. Third of all, there are cactuses (no proper cacti~ but hey~ they ARE kinders:)."
Yep~ a GENIUS answer. All that is left is the concluder. Here is an example of the transition of our year. One question, five different answers......
Question: "What habitat is this?"
Baby talk: a desert
College talk: "I think that habitat is a desert."
College graduate talk: "I think that habitat is a desert because it looks hot."
College graduate talk with an adder: "I think that habitat is a desert because it looks hot and dry."
And then of course the best answer~ the GENIUS answer above.
Now I KNOW if my kinders can do it~ those 5th graders can too!!!!!
Have fun!