关于pos标记器：nltk pos_tag的用法

nltk pos_tag usage

我试图在NLTK中使用语音标记，并使用了以下命令：

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>>> text = nltk.word_tokenize("And now for something completely different")

>>> nltk.pos_tag(text)

Traceback (most recent call last):
File"<pyshell#4>", line 1, in <module>
nltk.pos_tag(text)
File"C:\\Python27\\lib\\site-packages\
ltk\\tag\\__init__.py", line 99, in pos_tag
tagger = load(_POS_TAGGER)
File"C:\\Python27\\lib\\site-packages\
ltk\\data.py", line 605, in load
resource_val = pickle.load(_open(resource_url))
File"C:\\Python27\\lib\\site-packages\
ltk\\data.py", line 686, in _open
return find(path).open()
File"C:\\Python27\\lib\\site-packages\
ltk\\data.py", line 467, in find
raise LookupError(resource_not_found)
LookupError:
**********************************************************************
Resource 'taggers/maxent_treebank_pos_tagger/english.pickle' not
found. Please use the NLTK Downloader to obtain the resource:

但是，我收到一条错误消息，显示：

1	engish.pickle not found.

我已经下载了整个语料库，并且在maxtent_treebank_pos_tagger中有english.pickle文件

我该怎么做才能使它正常工作？