happen完成时延续性begin变成 have been onhappen变成什么

happen完成时延续性begin变成 have been onhappen变成什么
happen完成时延续性
begin变成 have been on
happen变成什么

happen完成时延续性begin变成 have been onhappen变成什么
英语中,并不是每个瞬间性动词都可以换成延续性的.建议用"It's +一段时间+since ...happened."这种句型.