I wonder if the first sentence in each pair has the same meaning with the following second sentence.<br/><br/>Please check it out.<br/><br/>Thanks.<h2></h2><h2></h2><h2></h2>1. <br/><br/>a. He must be a good walker to have walked such a long distance.<br/><br/>b. He must be a good walker, having walked such a long distance.<br/><br/>2.<br/><br/>a. A man was seen to enter the room.<br/><br/>b. A man was seen entering the room.