This semester-long study examined the functions for which English (L1) and Spanish (L2) were used in two intact hybrid Spanish as a foreign language (FL) university classes at the 202 (fourth semester) level. Five 75-minutes classes of two instructors were observed by the researcher, video- and audio-recorded, and transcribed. A survey was also used to determine the functions for which the instructors and students believed that Spanish and English were used in the classroom, and the functions for which both believed that the two languages should be used. Talking about a test and teaching grammar were the functions for which both instructors used the most English and the most Spanish. The questionnaire results indicated that the students who heard more Spanish in the classroom would have preferred that their instructor had used less Spanish for the functions of checking how well students understand a reading in class as well as when giving instructions or explaining how to do group activities. The Minnesota Language Proficiency Assessment for listening at the Intermediate-High level was administered to the students of both instructors at the beginning and at the end of the semester. The classroom observations indicated that although both instructors used more than 50% words in English during their classes, one instructor used twice as many words in Spanish as did the other. However, the results of the study revealed no significant relationship between the amount of Spanish used by the instructors in the classroom and the students' progress on listening proficiency from the beginning to the end of the semester.