appear的用法是什么？
1. 表示“出现”“露面”“到达”等，是不及物动词，因此既不能后接宾语，也不能用于被动语态。如：
雨后天空出现彩虹。
正：A rainbow appeared in the sky after the rain.
误：A rainbow was appeared in the sky after the rain.
2. 表示“似乎”“好像”，是连系动词，其后可接形容词、名词、不定式等作表语。如：
He appears (to be) quite rich 他似乎相当富有。
He appears to be living in the area. 他似乎就住在这一带。
It appears a true story. 它似乎是一个真实的故事。
3. 在 it appears 后可接 that 从句或 as if 从句。如：
It appears that he forgot to sign the letter. 他似乎忘记在信上署名了。
It appears as if she’s lost interest in her job. 看来她对自己的`工作已失去兴趣。
后接 that 从句时，有时可用 so, not 代之。如：
A：Are they reliable? 他们可靠吗?
B：It appears so (not). 似乎是可靠的(不可靠)。
4. 有时可与there be句式搭配使用。如：
There appears to have been an accident. 好像出了事故。
There appears to be a problem with the oil pressure. 看来是油压出了问题。
5. 比较以下同义句型：
He appears to have been waiting a long time.= It appears that he has been waiting a long time. 看来他已经等了很久了。
There appears to have been a mistake.= It appears that there has been a mistake. 看来一直就有错。
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