Accessing corpora: nltk.corpus
String processing: nltk.tokenize, nltk.stem
Collocation discovery: nltk.collocations
Part-of-speech tagging: nltk.tag
Classification: nltk.classify, nltk.cluster
Chunking: nltk.chunk
Parsing: nltk.parse
Semantic interpretation: nltk.sem, nltk.inference
Evaluation metrics: nltk.metrics
Probability and estimation; nltk.probability
Applications: nltk.app, nltk.chat

[...] load submodules. list of submodules is here. from nltk.book import * from nltk.corpus import [...]