錯解：It is cold yesterday.
正解：It was cold yesterday.
原因：yesterday應該用過去時
2、
錯解：We went to the mountains and ski all day.
正解：We went to the mountains and skied all day.
原因：all day從語境上講壹般用過去時，故將ski改為skied。（ski是規則動詞）
3、
錯解：We took a lot of photoes.
正解：We took a lot of photos.
原因：photo是photograph的縮寫，復數加s而不是es。