第三十九天

[nnozomi]

是...的 to emphasize a specific point
https://resources.allsetlearning.com/chinese/grammar/The_%22shi..._de%22_construction_for_emphasizing_details

Let's stick to the easy half of this (as it strikes me) today and move on to the use in past questions tomorrow...

Guardian: (ugh, this is impossible to search for without knowing more about 正规表现 than I do)
我们都是从地星来的。(it's from Dixing that we all came)
让是你来指认现场的，不是让你去打先锋的 (it's to confirm the site that you're here, not to go strike the first blow) (?)
但是强大是要付出代价的 (but strength requires paying the price)

My practice:
我是坐地铁来的，走路太远了。
昨晚你原来是跟他去玩的！

Comments

[sakana17]

I'm not sure if this (from The Rebel, episode 24) exactly fits... It's a question, but its purpose is to state something the listener (Hu Daoyi) should have figured out already: 都是耗电量很大的对吗

[nnozomi]

its purpose is to state something the listener (Hu Daoyi) should have figured out already: 都是耗电量很大的对吗
Oh, that's a good one, yes. (Hu Daoyi is like the definition of worse than useless, poor guy.)