YOU SAID:
Did you mowed the lawn yet?
INTO JAPANESE
あなたはまだ芝生を刈りましたか?
BACK INTO ENGLISH
Did you still mow the lawn?
INTO JAPANESE
あなたはまだ芝生を刈りましたか?
BACK INTO ENGLISH
Did you still mow the lawn?
That didn't even make that much sense in English.