可见【kějiàn】

可见 links a fact to the conclusion it proves: "which shows", "so evidently". The evidence comes first, then 可见 opens the next clause with what follows from it.

可见 takes no subject. The person drawing the conclusion is the speaker, and nobody is named in front of it.

• × 我可见他很忙 → 他连饭都没吃，可见他很忙

Fact first, conclusion second

The conclusion can't come before its evidence. To give the conclusion first and the reason after, use 因为 instead.

• × 可见他还没睡，屋里的灯还亮着 → 屋里的灯还亮着，可见他还没睡

由此可见 in writing

可见 is neutral to written: at home in an essay, and fine in speech when you're reasoning something out. When the evidence runs over several sentences, a written argument starts the conclusion as a new sentence with 由此可见, "from this it can be seen". That set phrase has its own point.

可见 also exists as an adjective, "visible", as in 肉眼可见 "visible to the naked eye". In that sense it sits inside a phrase and links nothing.