他表面上强硬,其实只是想争取谈判筹码而已。Tā biǎomiàn shang qiángyìng, qíshí zhǐ shì xiǎng zhēngqǔ tánpàn chóumǎ éryǐ.He appears tough on the surface, but in fact he is only trying to gain bargaining chips.
我只是开个玩笑而已,你别生气。Wǒ zhǐshì kāi ge wánxiào éryǐ, nǐ bié shēngqì.I was only joking, so don't be angry.
这道题并不难,你只是粗心而已。Zhè dào tí bìng bù nán, nǐ zhǐshì cūxīn éryǐ.This question is not hard; you were just careless.