2 4-bit-adder modules to make an 8-bit adder

CCC C. OP #3714708
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How can I obtain 8Bit full adder from 2 4-bit full adder ?
I found this code for 4-bit full adder and I tried to combined them but 
i didn't do this.
module fullAdder(
         input a,
         input b,
         input cin,
         output s,
         output cout );

        assign {cout,s} = a + b + cin;

endmodule

Could you help me how can I obtain this ?
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bko Guest #3715081
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how to connect instantiated modules by name:
http://www.asic-world.com/verilog/syntax2.html

e.g a two bit adder:
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module adder_2bit(

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         input [1:0] abus,

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         input [1:0] bbus,

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         input cin,

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         output [1:0] sumbus,

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         output cout );

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  wire ctemp1;

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   fullAdder u0 (

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           .a(abus[0])      ,

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           .b(bbus[0])      ,

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           .cin(ci)      ,

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           .sum(sumbus[0])    ,

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           .cout(ctemp1)

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           );

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   fullAdder u1 (

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           .a(abus[1])      ,

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           .b(bbus[1])      ,

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           .cin(ctemp1)      ,

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           .sum(sumbus[1])    ,

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           .cout(cout)

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           );

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endmodule
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