Hi S.:Sorry this is so long, but bear with me. I have several years of professional experience working with small children (both with typical and atypical functioning), and a degree in therapeutic recreation. I have heard a few children do this same sort of thing - especially when they are concentrating on a newer skill. He is still learning what order words fit together, and as long as he is getting his point accross that might not be as important as another new skill he is trying to figure out. If you have ever learned a foreign language you understand the process of having to think about words and the order they go in before you speak, and sometimes toddlers do not have that kind of patience or their mouths just move faster than their brains. I have also nocticed that children who reverse the order of words will often say the word that is more important/gets the point accross more efficiently first. In the example of ball basket, the ball is what he wants or is looking at and basket is just a clarifier. I wouldn't worry about his repeating it correctly after you have said it backwards, since he has heard that it doesn't sound right, so trys another way to say it. I aggree that for the next month or two you should try just correcting him. If he points and says "ball basket!" then you could say, "Yes, that is a basketball!" Or you could say "Do you want the basketball?" Be very matter of fact and do not try to make him repeat the correct way back to you. It will only frustrate him and will most likely turn into a power struggle. Encourage everyone who has contact with your son to do the same.If you are still feeling nervous or unsure, Speech Therapists are an excellent resource. Even if there is nothing "wrong" you will have piece of mind, and they can give a lot of valuable pointers about other ways to "correct" common speech issues. Besides that if there is an issue you will be able to recieve early intervention services. Most insurance companies cover it and the agency your foster son came to you through will most likely be able to give you a recommendation.
I hope this long rambling post was helpful!
Kathy