I opened my mouth to speak but he cut me off.

She opened her mouth to speak, but no sound came.

He opened his mouth to speak but no words came out.

He opened his mouth to speak, but nothing came out.

I opened my mouth to speak and he held a hand up.

I opened my mouth to speak, but no sound came.

I open my mouth to speak, but nothing comes out.

He opened his mouth to speak but nothing would come out.

Then he opened his mouth to speak, but said nothing.

Several times he tried to open his mouth to speak, but no words came.