summer需要加冠詞the嗎

前邊可以加冠詞，也可以不加，例如：

1、I haven't seen him since the summer before last.我已有兩個夏天沒見過他了。

2、Each summer a new batch of students tries to find work.每年夏天都有一批新的學生要找工作。

3、I made painting the house my project for the summer.把房子粉刷了一遍，這就是我的夏季工程。