Last night if he were with us，we would finish the task earlier.为什么用were

Last night if he were with us，we would finish the task earlier.为什么用were？he不是应该用was么？
我知道是虚拟语气 if i were you也是用were 虚拟语气所有的人称都用were么？

if he ( )last night,he( )to see me today. last night If you _________ that late movie last night, you wouldn’t be sleepy now. If you hadn't gone with Tom to the party last night, __________. last night是什么意思 求last night歌词 Iverson last night 艾弗森last night 歌词 求LAST NIGHT 歌词 王力宏 last night 歌词