不是用单三人称.。

　　二、be going to +动词原形与will+动词原形用法不清楚

　　例：我正努力学习，准备参加英语考试。

　　I am studying hard and I will try for my English exams.

　　答案：I am studying hard and I am going to try for my English exams.

　　解析：“be going to” 表示计划、打算要做某事。E.g. He is going to visit his friends. 还表示某种迹象表明会发生某事.e.g. Look at the clouds. It’s going to rain. 而“Will+动词原形 ”指对将来事物的预见、表示意愿、决心。E.g. I will wait for you until you come. 在单纯预测未来时，二者可以互换，但在此题中只能用be going to，而不能用will。

　　专项练习：

　　一、 单选

　　1 _____you ____a doctor when you grow up?

　　A Will; going to be B Are; going to be C Are; / D Will; be

　　2 I don’t know if his uncle _____. I think he _____ if it doesn’t rain.

　　A will come; comes B will come; will come

　　C comes; comes D comes; will come

　　3 He will be back _____a few minutes.

　　A with B for C on D in

　　4 What time _____we meet at the gate tomorrow?

　　A will B shall C do D are

　　5 He will have a holiday as soon as he _____the work next week.

　　A finishes B doesn’t finish C will finish D won’t finish

　　6 There _____some showers this afternoon.

　　A will be B will have C is going to be D are going to have

　　7 It ____my brother’s birthday tomorrow. She _____a party.

　　A is going to be; will have B will be; is having

　　C will be; is going to have D will have; is going to be