根据汉语意思完成句子。 1.电影已经开始半小时了。 The film for half an hour. 2.他的祖父去世两年了。 His grandfather for two years. 3.我已经在合肥呆了3天了。明天我打算回家。 I Hefei for three days. I plan to go back home tomorrow. 4.丹尼尔三年前买了这台电脑。 Danie...