[Grammar] Complex sentences; Using "don't", "want to", "although", "though", commas

[weak]

Complex sentences; Using "don't", "want to", "although", "though", commas

Are the sentences below correct? Do they have the same meaning?
"I don't understand you, but I really want to!"
"I really want to understand you, but I don't!"
"Although I don't understand you, I really want to!"
"I don't understand you I really want to though!"

 

[Rover_KE]

Re: Complex sentences; Using "don't", "want to", "although", "though", commas

#4 (if you had helpfully numbered them) is ungrammatical. The others are OK and mean the same to me, though I see no reason to use exclamation marks.

 

[weak]

Re: Complex sentences; Using "don't", "want to", "although", "though", commas

#4 (if you had helpfully numbered them) is ungrammatical. The others are OK and mean the same to me, though I see no reason to use exclamation marks.

Thank you. Could you tell me why #4 is ungrammatical?

 

[Rover_KE]

Re: Complex sentences; Using "don't", "want to", "although", "though", commas

It lacks punctuation after 'you' and 'to'.