This qualitative study examined how specific instructional supports intended to scaffold emergent bilinguals' oral production of explanations facilitated or constrained students' attempts to explain. Findings demonstrate that explanations were very rarely produced, and when they were produced, the explanations were not particularly informative. Furthermore, the teachers' attempts to support emergent bilingual talk via sentence starters, guiding questions, and rephrasing questions inadvertently undermined the students' attempts to explain.