Google Books Ngram Viewer

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

1950 - 1959 1960 - 1977 1978 - 1980 1981 - 2007 2008 they had spoke English
1950 - 1953 1954 - 1967 1968 - 1971 1972 - 2005 2006 - 2008 he had spoke English
1950 - 1962 1963 - 1969 1970 1971 - 2001 2002 - 2008 they have spoke English
1950 - 1957 1958 1959 - 1967 1968 - 2002 2003 - 2008 he has spoke English

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