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<iframe name="ngram_chart" src="https://books.google.com/ngrams/interactive_chart?content=i+worked,+i+was+working,+i+have+been+working&year_start=1800&year_end=2019&corpus=26&smoothing=3&direct_url=t1;,i%20worked;,c0;.t1;,i%20was%20working;,c0;.t1;,i%20have%20been%20working;,c0" width=900 height=500 marginwidth=0 marginheight=0 hspace=0 vspace=0 frameborder=0 scrolling=no></iframe>
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Part-of-speech tags
cook_VERB, _DET_ President _PROPN_
Wildcards
King of *, best *_NOUN
Inflections
shook_INF drive_VERB_INF
Arithmetic compositions
(color /(color + colour))
Corpus selection
I want:eng_2019, I want:eng_2009
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1800
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2019
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English (2019)
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English
2019
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Search in Google Books
i worked
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1800 - 1861
1862 - 2008
2009 - 2011
2012 - 2013
2014 - 2019
English
i was working
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1800 - 1895
1896 - 2012
2013
2014 - 2015
2016 - 2019
English
i have been working
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1800 - 1902
1903 - 2010
2011 - 2012
2013 - 2015
2016 - 2019
English