YOU SAID:

When he comes tell me that you'll let him in

INTO JAPANESE

彼が来たときにあなたが彼をさせてくれるだろうと私に言って

BACK INTO ENGLISH

Tell me you will let him when he comes

INTO JAPANESE

彼が来たら彼に連れて行かせるよ

BACK INTO ENGLISH

I will take him when he comes

INTO JAPANESE

彼が来たら私を連れて行きます

BACK INTO ENGLISH

I will take me when he comes

INTO JAPANESE

彼が来たら私を連れて行く

BACK INTO ENGLISH

Take him when he comes

INTO JAPANESE

彼が来たら彼を連れて行って

BACK INTO ENGLISH

Take him when he comes