想让他答应这样的要求恐怕不大可能。
[误] I'm afraid it is impossible for him to agree to such a request.
[正] I'm afreaid it is unlikely for him to agree to such a request.
注:impossible 表示“完全不可能”,所以与原文有出入。在英语中,probable 表示的可能性最大,其次是
possible,再次是likely。而常用的句式为it is probable/possible/likely for sb. to do sth.,或 sb. be likely to do sth.。