YOU SAID:

I ate five dinners last night

INTO JAPANESE

私は昨夜5つの夕食を食べました

BACK INTO ENGLISH

I had 5 dinners last night

INTO JAPANESE

私は昨夜5人の夕食を食べました

BACK INTO ENGLISH

I had dinner for 5 people last night

INTO JAPANESE

私は昨夜5人で夕食をとりました

BACK INTO ENGLISH

I had dinner with five people last night

INTO JAPANESE

昨夜は5人で夕食をとりました

BACK INTO ENGLISH

We had dinner with five people last night

INTO JAPANESE

昨夜は5人で夕食をとりました

BACK INTO ENGLISH

We had dinner with five people last night