John, as well as Peter, is going to the mall.

[Tan Elaine]

John, as well as Peter, is going to the mall.
John and Peter, as well Mary, are going to the mall.

Are both sentences correct and natural?

Thanks.

 

[Rover_KE]

They're correct, but not natural — native speakers don't say stuff like that.

They sound like pointless student exercises to paraphrase the natural sentences 'John and Peter are going to the mall' and 'John, Peter and Mary are going to the mall'.

 

[Tan Elaine]

Thanks, Rover.

You're right. Such sentences are given to students as exercises and in exams.

 

[Tdol]

They are highly artificial.