The adjective 不得了
We use the adjective 不得了 to express astonishment or to indicate the highest degree of an adjective.
不得了 
is usually used when talking about something surprising or incredible.
is usually used when talking about something surprising or incredible. Pay attention
It is often followed by the modal particle 了 .
.Examples
不得了了，刚刚买的牛奶已过期了
I can't believe it! The milk that I just bought has already expired
bùdéliǎo le, gānggāng mǎi de niúnǎi yǐ guòqí le
不得了了，我又忘记今天是考试！
Oh no, I forgot that today is the exam!
bùdéliǎo le, wǒ yòu wàngjì jīntiān shì kǎoshì
你的工资是三万块，真是不得了！
It's unbelievable! Your salary is 30,000 yuan!
nǐ de gōngzī shì sānwàn kuài, zhēnshi bùdéliǎo
不得了 can function as a state complement. In this case, it has the meaning "extremely", "very" or "exceedingly".
Pay attention
In a sentence, we should state the particle 得 between the predicate and 不得了.
Examples
今天冷得不得了，你千万别出去
It's very cold today. Please don't leave the house
jīntiān lěng de bùdéliǎo, nǐ qiānwàn bié chūqù
章子怡最近火得不得了，每个中国人都知道她
Everyone in China knows Zhang Ziyi. She is very popular nowadays
zhāngziyí zuìjìn huǒ de bùdéliǎo, měi ge zhōngguó rén dōu zhīdào tā
经理今天生气得不得了，你先别过来吧
The manager is very angry today. Please don't go in
jīnglǐ jīntiān shēngqì de bùdéliǎo, nǐ xiān bié guòlái ba
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