YOU SAID:

this is bob, bob says hi. this is bob when a train comes by

INTO JAPANESE

これはボブです、ボブはハイと言います。列車が来るときこれはボブです

BACK INTO ENGLISH

This is Bob, Bob says Hai. This is Bob when the train comes

INTO JAPANESE

これはボブです、ボブはハイを言います。列車が来るとき、これはボブです

BACK INTO ENGLISH

This is Bob, Bob says Hai. This is Bob when the train comes