Could you be more careful in future? 你以后能不能仔细些?
In future I won't bother asking him out anywhere if he's just going to complain that he's bored! 从今往后如果他抱怨说无聊,我不会再邀他出去玩。
In future I'm going to check every single piece of work that you do! 今后我要检查你做过的每项工作。
In future we'll have to monitor this area more closely.
In future we'll make sure we involve him in any big decisions.
See also: future noun (TIME TO COME)