Although AI is increasingly used by teachers in university language classes, how students perceive teachers’ use of AI in instruction and assessment remains unclear. This study aims to examine university students’ perceptions of the teacher’s use of AI in course instruction and assessment. A wide survey was conducted in mid-2024. Participants in this mixed-gender study were 990 Japanese EFL undergraduates aged 18 to 23. Among the 55 broad-ranging survey questions, this presentation focuses on the results obtained regarding students’ perceptions of teachers’ use of AI tools in classroom activities and assessments. More than 52% of the respondents reported that GenAI was used in some way in their university English classes, particularly for writing (48%) and reading (39%), whereas 46% of respondents wanted GenAI to be used more in speaking instruction. 65% of students preferred writing assessments by teachers or teachers collaborating with AI over AI assessments. Additionally, approximately 63% reported that they still need to learn English, even if AI replaces many English-language tasks. These findings indicate that both teachers and students should be responsible for the use of AI, providing evidence to support its use in classrooms.