问题: What kinds of sports are popular now but not popular 50 years ago?

Extreme sports like skateboarding and BMX are really popular now, especially among young people. They weren't around 50 years ago. These sports are exciting and a bit risky, which makes them really appealing. Plus, they're often featured in big competitions like the X Games, which helps increase their popularity.

Extreme sports such as skateboarding, BMX, and parkour have seen a significant rise in popularity over recent decades. These sports, characterized by their adrenaline-pumping nature, were virtually non-existent 50 years ago. Today, they not only attract a large youth demographic but are also prominently featured in major extreme sports events, adding to their appeal and visibility.

1. 过去完成进行时："在人气方面取得显著增长"使用过去完成进行时来描述一个从过去开始并持续到现在的进行中动作，为讨论的时间轴增添了深度。 2. 被动语态："50年前几乎不存在"使用被动语态强调了50年前这些运动的状态，而不指明谁认为它们不存在，这增添了正式的语气。 3. 现在完成进行时："也得到了显著展示"使用现在完成进行时描述了一个与过去行动相关且正在进行中的动作，有效地连接了过去和现在。

E-sports have become incredibly popular recently. They involve competitive video gaming, which wasn't possible 50 years ago because the technology didn't exist. Nowadays, there are big tournaments and even professional e-sports players, which shows how big it has become.

E-sports, or competitive video gaming, has emerged as a major sport, drawing massive audiences worldwide. This phenomenon was unimaginable 50 years ago due to the absence of necessary technology. Today, e-sports encompass organized, professional competitions and have even begun to offer lucrative careers and scholarships, reflecting its establishment as a legitimate and popular sport.

1. 过去完成进行时："50年前无法想象"使用过去完成进行时来强调电子竞技的历史不存在，为时间背景增添深度。 2. 现在完成时："已成为一项主要运动"使用现在完成时描述过去到现在的最新发展，突出电子竞技的持续相关性和增长。 3. 被动语态："甚至开始提供丰厚的职业和奖学金"使用被动语态聚焦于受到主语（职业和奖学金）的行动，强调电子竞技行业提供的福利。

MMA, or mixed martial arts, is really popular now, but it wasn't around 50 years ago. It combines different fighting styles, which makes it very interesting to watch. Organizations like UFC have helped it gain a lot of attention and a big following all over the world.

Mixed Martial Arts, commonly known as MMA, has dramatically risen in popularity, particularly with the emergence of organizations like the UFC. This sport, which integrates various combat styles, was nearly non-existent 50 years ago. Today, it captivates a global audience and enjoys extensive media coverage, highlighting its evolution into a widely recognized and followed sport.

1. 现在完成进行时：”在受欢迎程度方面已经显著上升“ - 这种时态用来表明一个动作在过去开始，并持续到现在，强调了 MMA 受欢迎程度的持续增长。 2. 定语从句：”集成了各种格斗风格“ - 这个从句提供了关于 MMA 的额外信息，增强了描述，使句子更加充实。 3. 被动语态：”被全球观众所迷恋“ - 使用被动语态将焦点从执行动作的主语转移到动作本身上，强调了 MMA 的广泛影响。