YOU SAID:

I have a headache, so I must be tired.

INTO JAPANESE

私は疲れているに違いないので、頭痛があります。

BACK INTO ENGLISH

Surely I'm tired, so I have a headache.

INTO JAPANESE

確かに私は疲れ、頭痛を持っているので。

BACK INTO ENGLISH

Certainly I'm tired and have a headache, so.

INTO JAPANESE

確かに、疲れているし、だから痛い。

BACK INTO ENGLISH

Indeed, tired, and so painful.

INTO JAPANESE

確かに、疲れて、とても苦痛です。

BACK INTO ENGLISH

Tired indeed, and very painful.

INTO JAPANESE

確かに、疲れて、非常に痛みを伴う。

BACK INTO ENGLISH

Indeed, tired and very painful.

INTO JAPANESE

確かに、疲れている、非常に痛みを伴う。

BACK INTO ENGLISH

Indeed, tired and very painful.