YOU SAID:

The first time you were able and you had to do something

INTO JAPANESE

初めて何かをすることができたとき

BACK INTO ENGLISH

the first time you can do something

INTO JAPANESE

初めて何かをすることができます

BACK INTO ENGLISH

can do something for the first time

INTO JAPANESE

初めて何かをすることができます

BACK INTO ENGLISH

can do something for the first time