汉译英：请把那把刀给我

1.这条红色的裙子多少钱?How much is this red dress?
2.他两周以前买了一台新电视 He bought a new TV two weeks ago.
3.孩子们已经走了 The children already left.
4.他姐姐半小时前关上了电视 His sister turned off the TV half an hour ago.
5.我哥哥在和朋友们一起吃午饭My brother is having lunch with his friends.
请把那把刀给我 Please give me that knife./Please pass that knife to me.
这辆自行车是mary的 This bike is Mary's.