the past ⇒ 已往他好吃懒做,现在完全变了样。 Yǐwǎng tā hào chī lǎn zuò, xiànzài wánquán biànle yàng. → In the past he was greedy and lazy — now he's completely changed.
已然
already be a fact
已经
already ⇒ 已经到深秋了。 Yǐjīng dào shēnqiū le. → It's already late autumn.
而已
⇒ 我没别的意思,只是提醒你而已。 Wǒ méi bié de yìsi, zhǐshì tíxǐng nǐ éryǐ. → All I'm doing is cautioning you. ⇒ 她只是说说而已,不会真做的。 Tā zhǐshì shuōshuō éryǐ, bù huì zhēn zuò de. → She's all talk – she won't really do it.
不得已
have no alternative but to ⇒ 这也是不得已而为之的事情。 Zhè yě shì bùdéyǐ ér wéi zhī de shìqing. → This is one of those things we have no alternative but to do.
万不得已
as a last resort
木已成舟
what's done is done
迫不得已
have no alternative ⇒ 市长迫不得已向市民道歉。 Shìzhǎng pò bù dé yǐ xiàng shìmín dàoqiàn. → The mayor had no alternative but to apologize to the townspeople.