Question

I shall return before a week correct the errors

Answer 1

I shall return after a week

Answer 2

Answer:

The given sentence can be written in two forms, that are "I shall return in a week " or "I shall return within a week ".

Explanation:

• Prepositions are the short words which come before a noun or pronouns in the sentence itself. Preposition is combination of Pre (before the word) + Position (placement).
• The sentence make the complete sense by the use of preposition. The word which combines the noun, pronoun or the phrases with noun.
• The preposition ‘of ‘used to indicate belonging to, relating to, reference, or to specify the count. In, by, of, at, with, about, within, from etc are prepositions.  

• The given sentence has error. It is describing about returning in a week, which means the action is going to complete in some period of time.

• We have ‘in’ and ‘within’ as prepositions which are used to denote the period of time.
• Preposition 'in' is used before a noun which indicates the time period. Generally ‘in’ is used at the end of time period.
• ‘Within’ is used before the end of time period. So the given sentence can be reframed using both ‘in’ and ‘within’.