来自侯媛彬的问题
therewere/was和therehave/hasbeen的用法和区别
therewere/was和therehave/hasbeen的用法和区别
therewas+名词单数Therewasahousebytheriver3yearsago.therewere+名词复数Thereweremangpeopleintheparkyesterday.therehavebeen+名词复数（是完成时态）Therehavebeentworiversherefor3years.therehasbeen+名词单数（也是完成时态）Therehasbeenariverherefor3years.
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