關係being + past tense?

There was a sound (那邊有一個聲音).
– 什麼聲音不明
Sound of undergrowth – 聲音是由矮樹叢發出
There was a sound of undergrowth(那邊有一個矮樹叢發出的聲音).
be disturbed – 被干擾(被動)，I am disturbed by you. – 我被你干擾
being disturbed(disturbed 是過去分詞) – 正被干擾(現在進行被動)，I am being disturbed by you. -- 我現在正被你干擾
There was a sound of undergrowth being disturbed. =
There was a sound of undergrowth(那邊有一個矮樹叢發出的聲音), and the sound was being disturbed(這個樹叢聲正被干擾).
還是不知樹叢聲被??干擾，有可能是動物爬行，更有可能是被飛機飛過的燥音所干擾
再多寫一點
There was a sound of undergrowth being disturbed by the noise from the aircraft (樹叢的聲音被飛機的燥音蓋過去了)
這樣該懂了?