"Die Lehrer essen Sandwiche."

[liminal]

what makes the 'Lehrer' plural?

[magicLamp76]

Take note of the 'Die' and the 'essen'. At singular it would be: Der Lehrer isst Sandwiche.

[rtye123]

Here are correct forms for teacher:
indoctrinator Lehrer m
instructor Lehrer m
schoolmaster Lehrer m
teacher Lehrer m; Lehrerin f

[Pretenshus]

Tricky one :U

[WW82]

the word 'Sandwiche' at the end was inaudible/too robotic. I had to skip because I just couldn't hear what it was.

[bemar31]

Agree