YOU SAID:

cheers mate, nan's sat at the top of the stairs thinking she’s the chaser

INTO JAPANESE

乾杯、ナンは自分がチェイサーだと思って階段の上に座っていた

BACK INTO ENGLISH

Cheers, Nan was sitting on the stairs thinking she was the chaser

INTO JAPANESE

乾杯、ナンは自分がチェイサーだと思って階段に座っていました

BACK INTO ENGLISH

Cheers, Nan was sitting on the stairs thinking she was the chaser