「けれども」と「けど」と「けれど」はいったいどう違うんですか。「けれども」はテレビ番組でよく使われているが、「けれども」は「けれど」より丁寧ですか。

_**English translation:_** What exactly do 「けれども」 and 「けど」 and 「けれど」 mean?
They often use 「けれども」 on TV programs, but is 「けれども」 more polite than 「けれど」?
CC BY-SA 3.0
2011-07-15T22:35:10.587
1964
2018-10-27T17:02:39.383
2011-07-16T03:49:17.167
119
23
question
word-choice
What is the difference between 「けれど」 and 「けれども」 and 「けど」?
`けど` is short for `けれど`, and hence, is colloquial and less polite. `けれども` has
`も` 'even' added somewhat redundantly. I don't see clear differences between
`けれど` and `けれども`. The difference among the three may be parallel to the
difference among English `though`, `although`, and `even though`. So if a
native English speaker can tell the difference among them, it may be a clue
for telling the difference for the Japanese words.
CC BY-SA 3.0
2011-07-15T23:01:27.290
1965
2011-07-15T23:07:06.400
2011-07-15T23:07:06.400
1964
answer
The difference lies in how polite they are. The longer the word, the more
polite it is.

The shorter a word, the more curt and impolite it is.
CC BY-SA 3.0
2011-07-18T15:30:41.187
2034
2011-07-18T15:30:41.187
69
1964
answer
けれど is 98% used only in writings.  
It’s slightly more polite than けど, though, it sounds awkward if you use it in
conversations.

For example, if you want to say “I’d like to visit Japan but I’m too busy”,  
you would say “日本にはいきたい **けど** 、忙しすぎる。" in a conversation with your friend
whereas you would write “日本には行きたい **けれど** 、忙し過ぎるんです。” in your blog, which
should be a little more polite.

**けれども** is definitely more polite than these two, and is used in both
speakings and writings.

けれども can be used for someone like your customers or boss, but not for
presidents or priests. For those people or in a formal situation where you
should be very polite (not necessarily with priests but with people you have
to be polite to), “ **ですが** “ is usually used instead.

As for the levels of politeness,  
けど(informal)<けれど(only in writings)<けれども(polite/formal)<ですが(very polite/formal)
CC BY-SA 4.0
2018-10-26T23:24:36.520
62448
2018-10-27T17:02:39.383
2018-10-27T17:02:39.383
31724
31724
1964
answer