I Believe That

I don't know why I keep hearing so many of my students saying, "I believe on that." Although the word on has many definitions (and can be a preposition and an adjective depending on usage), it's incorrect to use it to affirm a certain belief. The correct expression, after all, is simply, "I believe that."

Here are some examples:

I believe that the government is unjust.
Do you believe that he cheated on the test?
They believe that the computers are already outdated.

We never, ever say, "believe on that" for anything!