在“There are a lot of difficulties facing us"中,动词ing作什么成分

在“There are a lot of difficulties facing us"中,动词ing作什么成分
在“There are a lot of difficulties facing us"中,动词ing作什么成分

在“There are a lot of difficulties facing us"中,动词ing作什么成分
修饰difficulties 意思是我们面临的困难

there be doing

现在分词引导状语