Effects of synchronous and asynchronous computer-mediated communication (CMC) oral conversations on English language learners' discourse functions

► Asynchronous CMC produced significantly more question types than synchronous CMC. ► Asynchronous CMC produced more question strategies than synchronous CMC. ► Asynchronous CMC supports questions with long answers. ► Asynchronous CMC promotes questions seeking more details. ► Synchronous CMC supports question which are based on short answers.