非谓语 语法填空When _________(describe) his entertaining traffic signal,Tony said…(省略)describing 为什么?

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非谓语 语法填空When _________(describe) his entertaining traffic signal,Tony said…(省略)describing 为什么?

非谓语 语法填空When _________(describe) his entertaining traffic signal,Tony said…(省略)describing 为什么?
非谓语 语法填空
When _________(describe) his entertaining traffic signal,Tony said…(省略)
describing 为什么?

非谓语 语法填空When _________(describe) his entertaining traffic signal,Tony said…(省略)describing 为什么?
这是分词做状语,逻辑主语是Tony,Tony和describe质检是主动关系,所以答案是describing.

when引导的是个从句,Tony said…才是其真正的主句。
而describe是个动作,执行describe动作的是Tony ,所以Tony是describe的逻辑主语而且他们之间是主动关系,所以用describing

主语是Tony 且与describe构成主动关系 所以填现在分词
还有就是如果后面有by就直接填过去分词