介词 - 顺序介词和条件介词

at some point subsequent to when something happens

used to indicate that one event happens earlier than another event in time

used to indicate what happens as a result of something

used to indicate that something happens or is done before a particular event or point in time

following in time or order

used to convey that something is happening or exists after and often due to another event or action

‌used to present an alternative suggestion in case something does not happen or succeed

if a specific situation or event occurs

if a particular situation occurs