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`面白{おもしろ}そうですね` | `楽{たの}しそうですね`  
---|---  
Sounds interesting. | Sounds like fun.  
That sounds interesting. | Sounds like you're having fun.  
Sounds like fun. | That sounds like fun.  
Looks interesting. |  
  
`面白{おもしろ}いですね` | `楽{たの}しいですね`  
---|---  
That's interesting. | It's fun.  
Interesting. | That's fun.  
It's interesting. | This is fun.  
It's funny. | It's fun, isn't it?  
  
`そうです` | `そう`  
---|---  
That's right. | All.  
Yes. | Thought.  
Yes, it is. | Really.  
Correct. |  
  
~~Does "そう" have something to do with "そか" here that affects this meaning?~~

**Why "そう" adds/means "sounds / looks" in "面白{おもしろ}そうですね / 楽{たの}しそうですね"?**
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question
grammar meaning translation word-choice
Why "そう" adds/means "sounds / looks" in "面白{おもしろ}そうですね / 楽{たの}しそうですね"?
You are talking about two different types of そう which are grammatically and
etymologically different. Since they are unrelated to each other to begin
with, the meaning of one cannot explain the meaning of the other.

そう as an adverb meaning "so" derived from the archaic adverb [然
(さ)](https://dictionary.goo.ne.jp/word/%E7%84%B6_%28%E3%81%95%29/#jn-84236),
which meant "so" or "that way". On the other hand, the etymology of そう(だ)
meaning "to sound/look" is not very clear, but dictionaries say it's probably
from either 様 or 相.

When you see そうです preceded by nothing, this そう means "so". If そう is preceded
by a masu-stem or an adjective, it means "looks/sounds". (And of course there
is [そう for hearsay](https://japanese.stackexchange.com/q/2729/5010), too.)
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answer