The pronoun 'which' can be used to specify something or someone:
I asked my son which girl he was going to ask to the dance.
Which TV program shall we watch?
The pronoun 'which' can be used to refer to something previously mentioned:
I took a first aid workshop, which ended on Friday.
I'm using my best linens and china, which were wedding gifts.
What technique is being used? The moon is faithful, although blind
"You played tennis anyway" is the independent clause; "although it was raining" is the dependent clause. An independent clause can stand on its own as a sentence, but a dependent clause cannot be a sentence.
The subordinate clause of the sentence is -- Although the ostrich is a bird
Yes, that is a complete sentence because it has a subject (he) and a verb (refused), although it does need a period after 'refused'. That's all you need to form a sentence.
Acids are usually poisonous although few are not.
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 start a sentence with "although." For example: "Although it was raining, we decided to go for a walk."
They were happy although they were poor.
Although he hasn't agreed with the idea, Al thinks he does.
Yeah, sure you can start a sentence with although. For example: Although I new I couldn't afford to make the monthly payments on the car, I bought it anyway.
Although it was raining heavily, he decided to go for a run in the park.
conjunction
although
yes
"Though" and "although" are both used to introduce contrasting or unexpected information in a sentence. "Although" is considered more formal and is typically used at the beginning of a sentence, while "though" can be used in the middle or at the end of a sentence for a more casual tone.
Although it is raining, I decided to walk outside anyway.
Although it was raining, we still went outside to play football.