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<iframe name="ngram_chart" src="https://books.google.com/ngrams/interactive_chart?content=concern+for,concern+about,concern+of,of+concern&year_start=1800&year_end=2019&corpus=26&smoothing=3&direct_url=t1;,concern%20for;,c0;.t1;,concern%20about;,c0;.t1;,concern%20of;,c0;.t1;,of%20concern;,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))
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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
concern for
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1800 - 1818
1819 - 1972
1973 - 1980
1981 - 2009
2010 - 2019
English
concern about
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1800 - 1846
1847 - 1988
1989 - 1994
1995 - 2009
2010 - 2019
English
concern of
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1800 - 1830
1831 - 1967
1968 - 1976
1977 - 2000
2001 - 2019
English
of concern
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1800 - 1910
1911 - 1981
1982 - 1987
1988 - 2009
2010 - 2019
English