<span style="color:#ff0000;">a. I expect that he will arrive on time.</span><br/><br/>Does this mean<br/>1. I think he will arrive on time.<br/>2. I require him to arrive on time.<br/><br/>I am sure it could mean (1), but I don't think it could mean (2). On the other hand,<br/><span style="color:#ff0000;">b. I expect him to arrive on time.</span><br/>is ambiguous.<br/><br/>That is how I see things. I might be wrong.<br/><br/>Many thanks