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<iframe name="ngram_chart" src="https://books.google.com/ngrams/interactive_chart?content=to-do's,to-dos&year_start=1800&year_end=2019&corpus=29&smoothing=3&case_insensitive=true" 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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British English (2019)
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British English
2019
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Search for "to-dos" yielded only one result.
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Search for "to-do's" yielded only one result.