This pattern shows the natural or fitting consequence of action or event.

- 는 것은 당연하다 is used with action verbs
- ㄴ것은 당연하다 is used with the verb 이다 and descriptive verbs ending in a vowel
- 은 것은 당연하다 is used with descriptive verbs ending in a consonant

Examples:
그렇게 생각하는 것은 당연해요./It is natural that you think so.
화를 내는 것은 당연했어요./It was natural for him to be angry.