[HUE]

If he's of an advanced level and focusing on business English, I can understand the lack of interest in charades. Role plays and dialogues, assuming they focus on immediately real and relevant language, are very, very beneficial.

He may need to understand that a role play allows him to mimic real use of the language, including any dynamic, unexpected occurrences. Studying sentence structures and vocabulary all day may mean he understands the information when encountered, but he won't be able to put it to use.

Compare the role play to sports. If someone shoots hoops all day on the basketball court, he may become quite good. However, this doesn't mean he's ready for a game. Hence the coach has players play practice games because they allow all the other components to be used too. The same holds true of role plays and many other activities.

Good luck, and let us know how it goes.