区分介词和连词 It is easy to be wise after the event after为何是介词

it is easy (to be)wise after the event为什么用be?be不是be动词 代表的是am 提问：It's easy_(be)wise after the event after什么时候是介词 什么时候是连词 怎么区别after 是介词还是连词 区分介词和连词It is getting harder every day for a lazy man to get 事后诸葛人人都会做(翻译) It's_____ _____ _____ wise after the event 如何区分TO是介词还是连词? 区分be able to和can.My brother( )swim very well.介词填空.The boy is it is vulgar to be after money all the time 怎么区别after作连词还是介词 怎样区分介词和连词 怎么区分连词和介词