YOU SAID:

I think I will be gone by lunch

INTO JAPANESE

私はランチで行ったと思う

BACK INTO ENGLISH

I think I went at lunch

INTO JAPANESE

私はランチに行ったと思う

BACK INTO ENGLISH

I think I went to lunch and

INTO JAPANESE

私はランチに行ったと思うと

BACK INTO ENGLISH

I went for lunch and I think

INTO JAPANESE

お昼に行ってみたし、思う

BACK INTO ENGLISH

Tried going to lunch, I think

INTO JAPANESE

ランチに行くことを試みたと思う

BACK INTO ENGLISH

I tried to go to lunch and

INTO JAPANESE

ランチに行ってみました、

BACK INTO ENGLISH

We went to lunch,

INTO JAPANESE

ランチに行きました

BACK INTO ENGLISH

I went to lunch

INTO JAPANESE

ランチに行きました

BACK INTO ENGLISH

I went to lunch