YOU SAID:

I will have had a cake for dinner, and after that, I will have had had a cake.

INTO JAPANESE

私は夕食にケーキを食べたでしょう、そしてその後、私はケーキを食べていたでしょう。

BACK INTO ENGLISH

I would have had a cake for dinner, and then I would have eaten the cake.

INTO JAPANESE

私は夕食にケーキを食べていただろうし、それから私はケーキを食べていただろう。

BACK INTO ENGLISH

I would have had a cake for dinner and then I would have eaten the cake.

INTO JAPANESE

私は夕食にケーキを食べていただろうし、その後、私はケーキを食べていただろう。

BACK INTO ENGLISH

I would have had a cake for dinner and then I would have eaten the cake.