A。でも、～B。(A. Demo, ~B): meaning and how to use it (JLPT N5 grammar)

At a glance

でも means "but" or "however". It starts a new sentence that goes against what the previous sentence led you to expect.

[Sentence A]。でも、[Sentence B]。

この部屋へやは狭せまいです。でも、きれいです。 This room is small. But it's clean.

でも is a connector. It comes at the start of sentence B:

Position	Register	Example
Start of sentence B	Polite speech	高たかいです。でも、おいしいです。
Start of sentence B	Casual speech	高たかい。でも、おいしい。

Sentence A ends with 。 and sentence B starts with でも. A comma after でも is common.