不及物动词 vi.
1.出现;显露
Gradually a smile appeared on her face.
她脸上渐渐地露出笑容。
2.似乎,看来好像
It appears they are right.
看来他们是对的。
He appeared to be talking to himself.
他似乎在自言自语。
3.出庭,到案
She will appear in court next Friday.
下星期五她将出庭。
4.演出;陈列;露面
The famous singer is appearing this fall at the Music Festival.
这位著名的歌手将在今秋的音乐节上演出。
5.出版,发表
His third play appeared under the title "The Web".
他的第三个剧本用《网》作书名出版。
“it”充当形式宾语，宾语从句后置的情况有下列几种：
一、在believe, consider, declare, estimate, fancy, feel, find, guess, hear, imagine, know, make, prove, reckon, think, understand 等动词接复合宾语(宾语＋宾补)时，要用it作形式宾语。在这种结构中that不可省略。例如：
We find it difficult that we should finish the work on time.我发现我们按时完成工作有困难。
She thinks it wrong that he didn't answer the phone.她认为他不接电话是不对的。
二、由动词和介词构成的短语动词后接 that 宾语从句时，要用形式宾语。 例如：
We are thinking of it that we'll lend you some money. 我正在考虑借给你钱的事。
I shall see to it that he is taken good care of when you are absent.你不在的时候我负责把他照顾好。
三、用于“动词+宾语+介词短语”的句型中。例如：
Keep it in mind that you have to be home by ten o'clock.要记住你得十点钟之前回家。
We took it for granted that he would come. 我们认为他来是当然的。
四、不可直接接宾语从句的情况。
在like, enjoy, love, hate, take 等表“喜怒哀乐”的动词，后若要跟宾语从句，需跟形式宾语 it。
I hate it when people talk with their mouths full. 我不喜欢人们满口饭说话。
I like it that everyone passed the exam. 都通过了考试我很喜欢。
五、不可直接跟that从句的情况。
下列动词不可直接接that从句：ask, refuse, let, like, cause, force, condemn, admire, celebrate, entreat, dislike(厌恶), overlook, love, help, take, forgive, bid, hate, hear(听见), see(看见), want(想要) 等，但可用it, the fact做媒介，后接that从句；或接动名词、不定式。例如：
He overlooked it that he had made another mistake. (正确) 他忽视了一件事，他又犯了一个错误。
He overlooked the fact that he had made another mistake. (正确)
He overlooked that he had made another mistake. (错误)
I admire it that they won the match. (正确)
I admire the fact that they won the match. (正确) 我很羡慕，他们赢得了比赛。
I admire that they won the match. (错误)
参考资料：http://edu.sina.com.cn/en/2005-03-11/31630.html