she worked as a model before becoming an actress为什么用becoming

Question

如题所述

Answer 1

before（在⋯之前），既可用作介词也可以用作连词。介词后面应该是名词或者代词作其宾语，become（成为）是动词，不可放在介词后，加ing后变成becoming ，就是动名词，动名词具有名词的特点，正确。如果作连词，可以改写为：She worked as a model before she became an actress.

Answer 2

介词后的动词要用ing形式
become 的ing形式是 becoming

She worked as a model before becoming an actress.
她成为演员之前是做模特。