本来
Meaning
本来 is an adverb with two main meanings: 1. “By rights”, “should have” — what logically ought to have been. 2. “Originally”, “at first” — an earlier situation.
1. “By rights” / “should have”
Subject + 本来 + 应该 + Verb
这件事本来应该听他的
2. “Originally” / “at first”
我本来不会开车，但现在开得特别好
这次招聘本来是小李负责的
本来 vs. 原来
我本来想去
原来你会说中文！
本来 → the original situation, plan, or what ought to have been.
原来 → something newly discovered or realised.
Quick rule
本来应该告诉你
我本来不会游泳
本来 ≠ 原来
本来 → the original plan or situation
原来 → a newly discovered fact