Usage note
虽然这个词用来表示转折关系，通常放在句子的开头或中间。
suīrán zhè gè cí lái yòng de biǎoshì zhuǎnzhé guānxì, tōngqū fàng zài jùzi de kāi头 or zhōng间。
The word 虽然 is used to express a contrast relationship and can be placed at the beginning or middle of a sentence.
Context note
虽然常用于表达尽管某件事情发生，但另一件事仍然成立的情况。例如：虽然下雨了，但我们还是去公园玩。
suīrán cháng yòng yú biǎo达 dùn měishì fāshēng, dàn lìngyī gè shìqíng réngránhěn tígōng. rúlèi: suīrán xià yǔ le, dàn wǒmen háishì qù gōngyuán wán.
虽然 is often used to express a situation where something happens but another thing still holds true. For example: Although it's raining, we are still going to the park.
5 examples
虽然他生病了，但他还是去了学校。
suī rán tā shēng bìng le， dàn tā hái shì qù le xué xiào。
Although he was sick, he still went to school.
虽然天气不好，但我们还是要出去玩。
suī rán tiān qì bù hǎo， dàn wǒ men hái shì yào chū qù wán。
Even though the weather is bad, we still have to go out to play.
虽然作业很多，但他还是按时完成了。
suī rán zuò yè hěn duō， dàn tā hái shì àn shí wán chéng le。
Although there was a lot of homework, he still finished on time.
虽然他很累，但他还是坚持锻炼身体。
suī rán tā hěn lèi， dàn tā hái shì jiān chí duàn liàn shēn tǐ。
Even though he was very tired, he still insisted on exercising.
虽然天气冷，但她还是穿了短裙。
suī rán tiān qì lěng， dàn tā hái shì chuān le duǎn qún。
Although it was cold, she still wore a short skirt.
5 mini stories
虽然今天下雨了，但我们还是去公园玩。妈妈说虽然天气不好，但我们可以带伞。
suī rán jīn tiān xià yǔ le， dàn wǒ men hái shì qù gōng yuán wán。 mā ma shuō suī rán tiān qì bù hǎo， dàn wǒ men kě yǐ dài sǎn。
Although it's raining today, we are still going to the park. Mom said that even though the weather is bad, we can bring an umbrella.
虽然他生病了，但他还是去了学校。老师说虽然他病了，但还是要来上课。
suī rán tā shēng bìng le， dàn tā hái shì qù le xué xiào。 lǎo shī shuō suī rán tā bìng le， dàn hái shì yào lái shàng kè。
Although he was sick, he still went to school. The teacher said that even though he is ill, he should still come to class.
虽然作业很多，但他还是按时完成了。爸爸说虽然任务重，但要按时完成。
suī rán zuò yè hěn duō， dàn tā hái shì àn shí wán chéng le。 bà ba shuō suī rán rèn wu zhòng， dàn yào àn shí wán chéng。
Although there was a lot of homework, he still finished on time. Dad said that even though the task is heavy, it should be completed on time.
虽然天气冷，但她还是穿了短裙。妈妈说虽然天气冷，但可以多穿衣服。
suī rán tiān qì lěng， dàn tā hái shì chuān le duǎn qún。 mā ma shuō suī rán tiān qì lěng， dàn kě yǐ duō chuān yī fu。
Although it was cold, she still wore a short skirt. Mom said that even though the weather is cold, we can wear more clothes.
虽然他很累，但他还是坚持锻炼身体。教练说虽然训练辛苦，但要坚持下去。
suī rán tā hěn lèi， dàn tā hái shì jiān chí duàn liàn shēn tǐ。 jiào liàn shuō suī rán xùn liàn xīn kǔ， dàn yào jiān chí xià qù。
Even though he was very tired, he still insisted on exercising. The coach said that even though the training is hard, we should keep going.
Mini dialogue
下雨天
A
虽然下雨了，我还是想去公园玩。
Suīrán xià yǔ le, wǒ háishì xiǎng qù gōngyuán wán.
Although it's raining, I still want to go to the park to play.
B
虽然公园很好玩，但是淋雨会感冒的。
Suīrán gōngyuán hěn hǎowán, dànshì línyǔ huì gǎnmào de.
Although the park is fun, getting wet in the rain can make you catch a cold.
做作业
A
虽然这道题很难，但是我会努力想。
Suīrán zhè dào tí hěn nán, dànshì wǒ huì nǔlì xiǎng.
Although this problem is hard, I will try my best to think.
B
很好，虽然慢一点，但一定能做出来。
Hěn hǎo, suīrán màn yīdiǎn, dàn yīdìng néng zuò chūlái.
Good, although it's a bit slow, you can definitely solve it.
Related words and contrasts
contrast
但是
dàn shì
but
虽然...但是... is a common pattern: 'although... but...'
contrast
可是
kě shì
but; however
Often used with 虽然 like 但是, but slightly softer.
similar
尽管
jǐn guǎn
even though; despite
A more formal synonym for 虽然.