1,表示说话时正在进行或发生的动作。
  Please don't make so much noise. I'm writing a composition. 不要吵闹。我正在写作文。
      Let's set off. It isn’t raining now. 咱们出发吧。现在不下雨了。
  这类情况常与now现在,at the present现在,at the moment现在,today今天,this week这个星期,this year今年等时间状语连用。有时通过上下文可以判断出应采用何种时态,    如:
      It's four o'clock in the afternoon. The children are playing football on the sports ground. 现在是下午四点。孩子们在操场上踢足球。
  Hurry up! We are all waiting for you. 快点!我们大家都等着你。
  Look! They are reading over there under the tree. 看!他们在那边的树底下看书。 Listen! She is singing in the room. 听!她在房间里唱歌。
  Where is Kate? She is reading in the room. 凯特在哪里?她在房间里看书。 Why are you crying? Is something wrong? 为什么哭呢?有什么不对?
2,表示现阶段正在进行而说话时不一定在进行的动作。
  We are working in a factory these days. 这几天我们在一家工厂工作。 They are compiling a dictionary. 他们在编一本词典。
  这类情况常与today今天,this week这个星期,this evening今天晚上,these days现在、目前等时间状语连用。
3,在口语中表示主语计划将要作的动作。
  They are leaving for New York tomorrow. 明天他们将要动身前往纽约。 Is your brother departing soon? 你的兄弟很快就要启程吗?
  这类情况常与come来,go去, leave离开,depart离开,arrive到达,stay逗留,start开始等动词连用。所用的动词必须是动作而不是状态,主语必须是人。
4,现在进行时与always等副词连用时带有感情色彩。
  He's always quarrelling with others. 他老喜欢跟别人吵架。
  She is constantly worrying about her son's health. 她不停地为她儿子的健康担心着。 The boy is forever asking questions. 那个男孩老是问问题。
  这类情况常与always总是,usually通常,continually不断的,constantly经常的,forever永远、老是等副词连用。