is σάντουιτς both singular and plural? Help please.
Yes. Foreing words are not conjugated at all.
Why its not accepted : The boys are eating sandwich
Theres a particle in front of σάντουιτς which is τα, also making it plural. Thus the sandwiches
And because eating sandwich isn't English. You can have
Sorry, I red somewhere else that τρώνε is used refeared to mixed male/female groups?
No, both female-only groups, male-only groups and mixed gender groups use 3rd plural verb forms, whichever they are.
It doesn't translate sandwich,only sandwiches. Why?
Because the article before σάντουιτς is in plural. ;)