You could be describing how something is similar or appears to be by the way it looks.

你可以来描述事物的相似之处或者它看起来像什么样子。

Here are some examples: 这里有一些例子: 

"It looks like a balloon."

 它看起来像个气球。

"It looks like a jellyfish."

 它看起来像个水母。

"It looks like a banana."

 它看起来像个香蕉。

"It looks like a fish."

 它看起来像条鱼。

You can also use 'it looks like' to describe something that might be in the future. 你也可以用'it looks like'来描述某事在未来会成为什么样子。

Here are some examples: 这里有一些例子: 

"It looks like it's going to rain."

 看起来好像要下雨了。

"It looks like it's going to be fun."

 看起来会很有趣。

"It looks like it's going to be a long day."

 看来这将会是漫长的一天。

You can also use it to describe something in the present tense.

你也可以用它来描述现在时态的某件事。

Here are some examples: 这里有一些例子: 

"It looks like they are leaving."

 看来他们要走了。

"It looks like he is waving to us." 

 看起来他在向我们招手。

"It looks like she is lost."

 看来她迷路了。

"It looks like they are racing."

 看起来他们在赛跑。