下面这句话中的：talking his head off 在while 后引导的句子中作什么成分Don't expect me to sit here like a good boy while Smith is up there talking his head off.
补充：这句话的 Smith is up there talking his head off.中的up there 难道是位置前置了？原句是 Smith is talking his head off up there.吗？
不是的。while引导的从句中，表语是up there。动名词短语talking…是伴随状语，或者主语补语。
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