how sb1 seem to sb2
一、“主语+ seem +（to be ）+表语”，表语多为名词或形容词，有时是其他的词或短语，以说明主语的特征或状态。例如：
Tom seems （to be ） a very clever boy. 汤姆看上去是一个非常聪明的男孩。
The man over there seems to be a new teacher. 那边的那个人看上去像一个新老师。
Mr Black seemed to be quite happy. 布莱克先生好像十分快乐。
This small town seems changed a little. 这个小城镇似乎有点儿变化。
二、“主语+ seem + 不定式”，此句型中的seem与不定式一起构成复合谓语。例如：
Mrs Green doesn’t seem （或seems not ） to like the idea. 格林夫人似乎不太喜欢这个主意。
The children seemed to be eating something in the room. 孩子们好像正在房间里吃东西呢。
The young man seemed to have changed much. 这个年轻人看起来变化很大。
三、“There + seem to be +名词”，其中to be 可省略。seem 的单复数形式要根据后面作主语的名词的单复数形式而定。例如：
There doesn’t seem to be much hope of our beating that team. 看来我们战胜那个队没有多大希望。
There seems no need to wait longer. 看来没有再等的必要了。
seem+不定式
The maths problem seems to be very difficult to work out.这道数学题似乎很难解决。
I seem to have caught a cold.我好像是感冒了。（这貌似也不是seem to have 的句式...）
常用的有 1. seem+形容词，2. seem+名词， 3. seem+不定式，4. seem+过去分词，5. seem+doing，6. seem+like+n./ V-ing，意思是"看起来像……"，7. There seems to be...,意为"似乎有；好像有……" ,8. It seems/seemed +that从句,9. It seems/seemed + as if从句
不过没有你要的seem to do、seem to have ~
也就是2觉得1怎么样
句子不完整。
A seem like/as B.
A seems to be B.
以上这些是"A像是B"的说法。
你给出的句子，最多可以理解成对B来说，A是怎样的。
A seems to B as her older brother, not boyfriend.
但一般没有人这么说，更顺耳的说法：
It seems to B that A is her older brother, not boyfriend.
笪陶复方： 是的,sb是somebody(某人)的缩写也就是2觉得1怎么样
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