“for example：”后面必须接上一句话吗

for example后面接句子
such as 后面接短语或单词。
Like 后面都可以接。

可以放后面，比如：Great men have often risen from poverty -- Lincoln and Edison, for example.
大人物常常出身贫寒，例如林肯和爱迪生。

no，but you need to add a comma,then followed by a sentence.