помогите определить время в английском языке (внутри)!

нужно определить время в предложениях :
1.The romans achieved a high level of law enforcement.
2.Each noble generally appointed an official, known as a constable, to carry out the law.
3.The development of the British police system is especially significant.
4.The British police have traditionally remained aloof from partisan politics and have depended on loyalty to the law.