Tuesday, February 21, 2012

grammar - present simple and adding s after the Sentence

why do i have to add s after the word causes in the follow Sentence i know that it is because causes is present simple but when i look at the grammar it say i/we/you/they take drive/work/do etc. he/she/it take drives/works/does etc
but the Sentence dose not start with any of them




Bad driving cause(s) many accidents.



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