YOU SAID:

The parcel ought to be here by the end of next week

INTO JAPANESE

その小包は来週の終わりまでにここにいなければなりません

BACK INTO ENGLISH

That parcel has to stay here by the end of next week

INTO JAPANESE

その小包は来週末までにここにとどまっていなければならない

BACK INTO ENGLISH

That parcel has to stay here by the end of next week