Return of a charatable trust

dear sir,
i read your article and it was ful of knowledge, but i want to ask some queries regarding my trust, 
we have audited our trust for py 10-11,  till then no accounts work has been done,

my client wants audit from 11-12 to 16-17,
can we file return of income from 11-12 to 16-17 along with audit ? 
we dont have any income and expense from 11-12 to 16-17

please reply.