like与unlike怎么区分

下面这个句子有问题吗?

The teacher only likes good students, and unlike bad students.

unlike英 [ˌʌnˈlaɪk] 美 [ʌnˈlaɪk]

prep.不像;（表示属性）与…不同

adj.不同的;相异的;不相似的

这是一个有问题的句子。主要问题出在误将unlike用作动词。在现代英语中，unlike只用作介词或形容词，不用作动词。如：

They are so unlike that nobody would believe they were sisters. 她们毫无相似之处，谁也不相信她们是姐妹。

She is unlike her mother; she is tall and her mother is very short. 她不像她妈妈;她很高，而她妈妈很矮。

For twins, they are very unlike. 作为一对双胞胎，他们很不一样。

She was unlike him in every way except for her coal black eyes.

她除了那双乌黑的眼睛外，跟他没有一点儿相像。

Unlike so many of his comrades he survived the war.

和许多战友不同，他在战争中幸存下来。

The doll-like figures in these stories are unlike anybody, let alone oneself.

这些故事中的玩偶形象跟谁都不像，更不用说像自己了。

She is unlike her mother; she is tall and her mother is very short.

她不像她妈妈，她很高，而她妈妈很矮。

The difference is not unlike between heaven and earth.

何啻天壤之别。

It was unlike Gordon to display his feelings

戈登不太可能表露他的情感。

This was a foreign country, so unlike San Jose

这是外国，与圣何塞很不一样。