YOU SAID:
The green grass grew on the ground
INTO JAPANESE
緑の芝生が地面に成長した
BACK INTO ENGLISH
Green grass grew on the ground
INTO JAPANESE
緑の芝生が地面に生えていた
BACK INTO ENGLISH
A green lawn was growing on the ground
INTO JAPANESE
緑の芝生が地面に成長していました
BACK INTO ENGLISH
Green lawn growing on the ground
INTO JAPANESE
地面に成長している緑の芝生
BACK INTO ENGLISH
Green lawn growing on the ground
You've done this before, haven't you.