火车已经离开半小时了The train left half an hour ago.（我觉得还是不要用完成时态的好，因为毕竟leave或go都是瞬间动词）跟老朋友在新的公园里打牌和下中国象棋是很开心的。It is quite happy to play cards and chinese chess with old friends in the park.开心这里应该由很多种表达，个人其实倾向于entertaining，用动名词更能表达令人...的效果你一个人单独在家是会感到孤单吗？Will you feel lonely when you are at home alone.（大概是考lonely 和 alone)他去哪...
