一、 通则：seem, look, appear＋形容词
举例一：He seems angry. (他似乎生气了。)
举例二：John appears unaffected by all the media attention. (约翰似乎未受媒体关注的影响。)
举例三：She looks very happy. (她看起来非常高兴。)
※ 注意：后面不可以接 副词 噢！
二、 语法结构的差异：
seem, appear + to + 动词 表示已发生的状态、行为
举例一：He does not appear to be at the office now.（他现在好像不在办公室。）
举例二：I seem to see someone going into my house.（我好像看见有人走进了我的家。）
It seems/appears to + have + P.P 表示在这之前就已经发生的完成式状态、行为
I seem to have lost my way. Can you help me? (我好像迷路了。你能协助我吗？)
It seems like / It looks like…
举例一：It looks like David will be able to come too. (看来大卫好像也能来。)
举例二：It seems like their marriage is over. (他们的婚姻好像结束了。)
It seems that / It appears that…
举例一：It appears that you might be right.（看起来你可能是对的。）
举例二：It seems that light energy will be an important subject of scientific research in the future. (看来，在未来的年代里，光能是科学研究的重要课题。)
总结：
Look 和 seem 后面可以接 like 所引导的子句 ，但 appear 通常不行。
Seem 和 appear 后面经常接「to + 原形动词」或「to + have + P.P.」来表示较早发生的动作或状态，但 look 则没有这项用法。
It seems 和 It appears 后面可以接 that 描述，但 It looks…则不行。
三、语意的差异
Seem：
客观的事实、印象或感想
举例一：It seems a shame that we can’t take David on holiday with us. (不能带着大卫跟我们一起度假似乎很可惜。)
举例二：It doesn’t seem like a good idea to leave him here by himself. (让他独自一人留在这里似乎不是个好主意。)
主观和情绪上的印象或感想
举例一：You seem to have some reservations. (你似乎还有些不同看法。)
举例二：You seem too strict with your young ones. (你对孩子管得似乎太严了。)
Appear：
比 seem 更正式些，通常用于客观的事实、印象或感想。
举例一：They have the same surname, but they don’t appear/seem to be related. (他们的姓氏相同，但似乎没有亲戚关系。)
举例二：She’s not getting any better. It seems/appears that she’s not been taking the medication. (她的病情没有任何好转。她似乎一直都没有服药。)
Look
用法与 seem 相近，用来指从外表得到的印象或感想，可能是主观情绪或客观事实。
举例一：He looked surprised when he heard the news. (得知消息时他显得吃惊。)
举例二：She looked pale. (她脸色显得苍白。)
