3、一般将来时

3.1、will/shall do： Next month， my sister will be nineteen. I shall/will return you the book tomorrow.

3.2、be going to do： The wall is going to be painted green. It is going to rain.

3.3、be to do表示按计划要发生的事： We are to meet at the school gate.

3.4、be about to do即将(正要)做某事： Autumn harvest is about to start.

4、一般过去将来时

He said that he would get married soon. I asked him when he would come here again.

5、现在进行时

5.1、表示说话时，或现阶段正在进行的动作或发生的情况。 They are making an experiment now.

5.2、计划即将发生，如go， come， leave， arrive： He is coming here next week and is staying here until August.