Mother either cooks something special for us or takes us to a restaurant at weekends.
What does "at the weekends" emphasize? Cooks something special for us or takes us to a restaurant?
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Sign up to join this communityMother either cooks something special for us or takes us to a restaurant at weekends.
What does "at the weekends" emphasize? Cooks something special for us or takes us to a restaurant?
User3169 is right, it is on weekends. It is unclear in the sentence whether on weekends modifies the entire sentence or just the second part (takes us to a restaurant), but if I had to guess, I would guess the entire sentence.
If you want to emphasize that on every weekend, mother either cooks something special or takes us out to a restaurant, then you can accomplish that by starting the sentence with on weekends.
On weekends, mother either cooks something special or takes us out to a restaurant.
If you would like to emphasize that mother cooks during the week, but on the weekend she takes us out to eat, you can accomplish that by saying:
Mother either cooks something special or on weekends takes us out to a restaurant.
By putting the modifying phrase directly in front of the clause, you are making it clear to the reader which clause the phrase is describing.