[译] 他对通过期末考试充满信心。
[误] He is confident in passing the final examinations.

[正] He is confident of passing the final examinations.
[正] He is confident that he will pass the final examinations.
[注] 表示“对……充满信心”，可以说 be confident of...，但其中的介词 of 不能换用 in。或者可以用“be confident that + 从句”，表示“有信心……”