答案:Branching refers to the positioning of subordinate clauses in relation to the main clause in a sentence. When subordinate clauses are positioned before the main clause, it is called left-branching, whereas if the subordinate clause follows the main clause, it is right-branching, (1) The computer is working properly now after the virus has been killed. (left-branching) (2) After the virus has been killed, the computer is working properly now. (right-branching)