Answer:
A) PUTOR- I used to think
B) PUTAVI-I will think
C) PUTABOR-I was thought
D) PUTATA ERO-I have been thought
E) PUTATO SUM- I will be thought
F) PUTAVERO- i will have thought
G) PUTABO- I have thought
H) PUTAVERAM- I was thought
I) PUTABOR-I will have been thought
J) PUTABAM-I had been thought
K) PUTATO ERAM-I think