"Tom got caught" is a colloquial variant passive form, more or less equivalent to "Tom was caught". On this basis, I would class "got" as an auxiliary and "caught" as the main verb.
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Cup cake'Tom got caught up in traffic'.I can't see this sentence as passive, so how would you classify both - got, and caught - in this example?I would say on balance that "caught up" is adjectival here.
Cup cakeThe traffic caught Tom?Well, to be evidence for the original question it would need to be "The traffic caught up
Cup cakeYes, I'm a native English speaker.OK, I'll try to remember that if and when I reply to any of your questions in future.
Cup cake' Tom got caught stealing a lap top.'By the way, something I forgot to mention ... "laptop" is one word.
Cup cake'Tom got caught up in traffic'.It's not passive because "traffic" is not the agent here. "Tom got caught up by traffic" would do the 'passive' trick.