on+动词：OnarrivinginBeijing,Iwillvisityou.

assoonas+时间状从：IwillvisityouassoonasIarriveinBeijing.

hardlwhen:IwillhardlyvisityouwhenIarriveinBeijing.

HardlywillIvisityouwhenIarriveinBeijing.

nosoonerthan：IwillnosoonervisityouthanIarriveinBeijing.

NosoonerwillIvisityouthanIarriveinBeijing.

(不过我记得将来时一般不用nosoonerthan这个句型的，既然你要求了，我就写了。希望对你有帮助！）