String Handling

I am writing a Shell Script.

Now i've problem in handling a string.

Eg: read string1

after i read in the string, i wan to add a space after it.
I've tried 1.) $string1 += " "
2.) string1 += " "
But both way cant works.
Does anyone got any idea how to solve my problem?

Thx for reading....

suppose your string1 gets the value ABC
and now if you want to append a space to it then
string1=${string1}'your space comes here'
i.e string1=${string1}' '

you could use another read perhapes . . .

echo $string1 " "| read string2?

this would add an extra string, but its easy to do . . .