Some of words are both v.t.and v.i. The expression of the result is the same or not.
For example:
I worry my son.
I worry about my son.
Roy Poon 5810 I worry my son. I worry about my son. e.
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Roy Poon 5810I worry my son.
I worry about my son.
"I worry my son" is a rather unusual thing to say, but it means that you cause your son to be worried/concerned about you, i.e. the opposite way round to "I worry about my son".