你想问的可能是在留学场景中，向他人表达“看到老师在吃饭”或者询问“老师在吃饭吗”该如何用英语表述。以下为你提供一些对应的说法：
- 陈述看到老师吃饭
- Isawtheteacherhavingameal.
- Icaughtsightoftheteachereating.
- Inoticedthattheteacherwashavinghis/hermeal.
- 询问老师是否在吃饭
- Istheteacherhavingamealnow?
- Istheteachereatingatthemoment?
- Istheteacherinthemiddleofhavingameal?