Although it's raining, we can still go out to play.
Although difficult, it's not impossible.
Although it is raining, I decided to walk outside anyway.
Ex: He/She tried to, but he/she couldn't (ENTER WORD) it.
Although it was cloudy, he was uncertain that it would rain.
although the two words are different, the semantics are the same.
Yes, it is a fragment, it's not a sentence. It could be a sentence without the word although. "I finished." is a sentence. Using the word "although" needs a sentence that the word is referring to either in front of it or after it. Although I finished, I was not happy with the work. I'm still hungry, although I finished my lunch.
Yes you can you can use it like although many people...... so yes you can if that answers your question
Although the weather was mild, dark clouds gathered ominously on the horizon.
Although he had explored caves in his teens, he did not consider himself a skilled spelunker.
Although she was only twenty-seven and premenopausal, she was still unable to become pregnant.
"The dancer, although very strong, looked delicate as she glided across the stage."
although she is reclusive in nature but his rakish and daunting style persuade her to offer him coffee.