Sentence examples for once that from inspiring English sources

"once that" is a grammatically correct and commonly used phrase in written English
It can be used to introduce a subordinate clause, meaning that the information following "once that" is dependent on the information in the main clause. It implies a cause-and-effect relationship or a condition that must be met. Example: Once that project is completed, we can move on to the next phase. (implying that the completion of the project is a necessary condition for moving on to the next phase)