Can you still use the headphones port on the iPhone 4 while using a HDMI output?

I recently got an iPhone 4, and i have a HD monitor and I want to get the adapter cable so i can watch shows from my iphone onto my monitor, however, my monitor doesn't have speakers, so i was wondering if it was still possible to output the sound to like headphones or speakers from the headphones jack on the iphone while the phone was outputting to HDMI

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