Read the following sentence.
"Hearing the knock, she opened the door."
What kind of synthesizer is the underlined word in the sentence? It is ______.
1
a gerund
2
a participle
3
an adverbial clause
4
a noun clause
Read the following sentence.
"Hearing the knock, she opened the door."
What kind of synthesizer is the underlined word in the sentence? It is ______.