YOU SAID:

Put your arm 'round her shoulder, now I'm getting colder

INTO JAPANESE

あなたの腕を彼女の肩の周りに置いて、今、私は寒くなっている

BACK INTO ENGLISH

With your arms around her shoulders, now I'm cold

INTO JAPANESE

彼女の肩の周りにあなたの腕で、今私は寒いです

BACK INTO ENGLISH

With your arms around her shoulders, now I'm cold