请教高手们英语翻译的句子

Question

这只钢笔坏了，我该另买一支了。

This pen is bad , I must buy another one.

可以这样翻译吗？如果不对劳请指点下问题所在。
直觉上觉得sunny800902说得正确，二楼的说得详细些，三楼的南邕我不知道对不对，还望其它朋友帮我参考下，要是我能判断对错的话我就不用来这里问各位大师了。

Answer 1

This pen is broken,so I'd better buy a new one.
坏了要用broken 两个句子中间要加连词so

Answer 2

This pen has broken, I should buy a new one.

Answer 3

This pen bad, I bought one of the other.
好了。

Answer 4

选二楼的

Answer 5

二楼是对的。