For Early Production students, questions that require a one-word response, such as yes/no and either/or questions, are acceptable. You also want to begin asking students at this stage questions that require a phrase or short sentence.
Speech Emergence students should be asked to answer questions that require a short-sentence response. It is OK to sometimes ask these students questions requiring a multiple-sentence response, but it is not OK to ask them questions requiring a pointing or one-word response.
How about Intermediate and Advanced Fluency students? It is OK to ask them questions that require a lot of verbal output, but it is not OK to ask them questions requiring minimal verbal output.