That's what we have learned today. 这里的have是干什么的,有什么用法

What we have learned that’s all we have time for today的意思和语法 what have we learned from Steve Jobs? it的用法,From my Mum's love and patience,I learned that what a what's we going to have for supper today? 译Notice that：In the simple present,We have learned that“he/s That's about all the news I have for now.这里的for now 是充当什么成分? And what will you have to drink,sir?解释have to 在这里的用法 we have learned two thousand English words 的被动句 what have you learned from beethoven?的答语是什么? so that we have something to leave for our chidren 这里的 have we have a new family joining us today,这里的join为什么要加ing?