I opened the envelope quickly so as to not change my mind.

Then I went into the living room and opened the envelope.

Bob started to open the large brown envelope he had brought with him.

I sat down at her table and opened the envelope with my name on it.

I wasn't going to open the envelope there and then.

Perhaps you will want to open the next envelope in his presence.

He saw the girl open the envelope and check what appeared to be a list.

He turned back to the desk, opened the second envelope, and began to read.

Stone opened the envelope and took out a single shee& of paper.

As if he could have stopped her from opening the envelope and reading what was inside!