[Grammar] by using or using or through using or with using?

[Asgarpour]

Which one is correct "by using" or "using" or "through using" or "with using" in the following sentences?

By using a computer, we can learn to read and write.?
Using a computer, we can ...?
Through using a computer, we can ...?
With using a computer, we can ...?

Please give a full explanation.

 

[emsr2d2]

1 and 2 are OK. 3 and 4 are unnatural although you might hear 3.