YOU SAID:
Yesterday is when I let my dog eat my couch
INTO JAPANESE
昨日は私の犬が私のソファを食べさせるときです
BACK INTO ENGLISH
Yesterday is when my dog will eat my sofa
INTO JAPANESE
昨日は私の犬が私のソファーを食べる時です
BACK INTO ENGLISH
Yesterday is when my dog eats my sofa
INTO JAPANESE
昨日は私の犬が私のソファーを食べる時です
BACK INTO ENGLISH
Yesterday is when my dog eats my sofa
That didn't even make that much sense in English.