The task went more easily than he had ever known it to before 这里用to是动词不定式to go的省略
He could get up earlier,creep into the barn 这里用creep的原型是因为是并列谓语 共用一个情态动词could 后面肯定 还有并列谓语 否则的话 应加and
原句是 He could get up earlier,creep into the barn and get all the milking done.