1. It's a kind of shopping by computer.
2. It's a kind of shopping on the computer.
3. It's a kind of shopping on-line.
4. It's a kind of on-line shopping?
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Are they all the same? Can we use 'on the computer' instead of 'by computer'?
2 answers
What exactly is this for, my dear? I would say that 3 & 4 are the same for sure. Don't use number 1, unless you have to. I really don't think that number 1 makes sense. 2 is ok, but again, use 3 & 4. Those make the most sense. Hope this helps!
All four are correct.
The phrase "on the computer" is more common, but "by computer" is not incorrect.
The phrase "on the computer" is more common, but "by computer" is not incorrect.