Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1960 - 1966 1967 - 1996 1997 - 2000 2001 - 2004 2005 - 2008 ability to English
1960 - 1966 1967 - 1996 1997 - 2000 2001 - 2004 2005 - 2008 ability to speak English
1960 - 1967 1968 - 1979 1980 1981 - 2001 2002 - 2007 ability may speak English
1960 - 1964 1965 1966 - 1977 1978 - 2001 2002 - 2008 ability of speaking English

Excluding ngrams with part-of-speech tags from search links.

Run your own experiment! Raw data is available for download here.
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