在英语中，当你要放学时，你可以说：

"It's time for me to go home."

"I'm finished with school for the day."

"I need to head out now."

"I have to leave now."

这些句子都是在描述你现在结束学校，要离开学校的意思。

另外，你也可以说：

"School's out for the day."

"School's over."

"The bell has rung."

这些句子都是在描述你放学的意思。

中文翻译如下：

"It's time for me to go home." - 我该回家了。

"I'm finished with school for the day." - 今天的学校我已经结束了。

"I need to head out now." - 我现在需要离开。

"I have to leave now." - 我现在必须离开。

"School's out for the day." - 今天的学校已经结束了。

"School's over." - 学校结束了。

"The bell has rung." - 铃声响起。