YOU SAID:
This is a test sentence and it is a funny thing!
INTO JAPANESE
これはテスト文です、面白いです!
BACK INTO ENGLISH
This is a test sentence is funny!
INTO JAPANESE
これはテスト文章は面白い!
BACK INTO ENGLISH
This testing grammar!
INTO JAPANESE
このテスト文法!
BACK INTO ENGLISH
This testing grammar!
That didn't even make that much sense in English.