Joshua has lived in Thailand since he was 6 months old and we've tried to get him to speak Thai but so far, he has not caught on.  At 4 years old, he talks a mile per minute in English but only a couple phrases in Thai.  As we are planning to be in Thailand long term, this will probably correct itself later on, but for now, he had a hard time with Thai people speak to him.  Often, there are three stages that Joshua goes through:

1) Listen to the Thai person talking to him

2) Wonder what on earth they said to him

3) Do his own thing - in this case, roar like a scary tiger