一、掌握单词和短语:
二、the number of 与a n umber of 的区别？
1.The number of the students in our school is about 3500.
the number of 一般接可数名词复数形式。
作主语时，谓语动词用单数
2.A number of students are playing in the playground.
A number of 常修饰可数名词复数形式，作主语时，谓语动词用复数
三、as well 和as well as
1.as well 意为“也，又”用于肯定句中，位于句首或句尾，句尾不用逗号隔开。
I am going to London and my sister is going as well .
