how to add row cell data in one row

USE []
GO
/****** Object:  Table [dbo].[ParaClassification]    Script Date: 11/25/2013 13:42:57 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[ParaClassification](
	[Para_Id] [int] IDENTITY(1,1) NOT NULL,
	[ParagraphText] [nvarchar](max) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
	[ParagraphRow] [nvarchar](max) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
	[Positive_Value] [int] NULL,
	[Negative_Value] [int] NULL,
	[ClassName] [nvarchar](max) COLLATE SQL_Latin1_General_CP1_CI_AS NULL
) ON [PRIMARY]

select sum(Positive_Value), sum(Negative_Value)
from ParaClassification
where ClassName='communication'

the output is 
2	0

i want to also concatenate the ParagraphText column 

1 Audi A4 1.8 TFSI Multitronic car Mileage is best.	  
	0	0	carVersion
					
					
4	economy of the car is 2.13 lakhs.
Its Conventional door is good enought. 0	0	carVersion

this are two row that i want concatenate the paragraphtext 

plz reply