"This place is too scary!"

Translation: 这个地方太可怕了！

[M4k6]

Why is 了 required at the last in this sentence?

[Cinnamon5230]

In simple words, 太 + adj. (+ 了) is a common expression for too + adj. The character 了 can be omitted, but I'm not sure whether Duolingo accepts the omission or not (if it doesn't, please report it).

I can't come up with an linguistic explanation for 太 + adj. + 了 structure. Personally I think 了 is actually a wide-spread phonetic loan. The real character should be interjection 啦.

[NasuSamaruk0]

Yes, 了 is the most common term used to express interjection. However, you can also use 啊

[Celticfiddleguy]

Actually I hear 啊 quite a bit, especially to express exclamation with surprise. Kind of like WOW!

[Cecil164832]

It shouldn't be. The sentence is fine with it omitted.

[uncannyrain]

I think the 了 at the end of the sentence is there because of the exclamation mark which indicates change of state or surprise not just a statement. I believe it is being used this way through this whole exercise.

[shiemi70]

why 了 ??

[GregCannon2]

太 usually is paired wjth a 了 at the end.

[rajul285485]

Na tai hao le!