YOU SAID:
The blue whale had started to move
INTO JAPANESE
シロナガスクジラが動き始めた
BACK INTO ENGLISH
The blue whale has begun to move
INTO JAPANESE
シロナガスクジラが動き始めました
BACK INTO ENGLISH
The blue whale has started moving
INTO JAPANESE
シロナガスクジラが動き始めました
BACK INTO ENGLISH
The blue whale has started moving
That didn't even make that much sense in English.