句子:He bent over his trunk again, but almost immediately stood up once more, his hand clenched on his wand.
问题:He bent over his trunk again, but almost immediately stood up once more.
这个两句是but 引导的并列句,his hand clenched on his wand 这个句子是独立主格结构吗?我个人觉得这个句子不是独立主格,因为his hand 与clenched 是主动关系,并不是被动。如果不是独立主格的,是不是也需要在“his hand clenched on his wand”前面加上and这个并列词?这样句子看上去更完整。