HSK 4 grammar · pattern
X就是了
…就是了 — just …, and that's that
Pattern
+ +
( ) can be left out · other words may come before, between and after
How it works
就是了 at the end of a clause tells someone to simply do the thing and not worry — "just …, and it'll be fine", "just … and that's that". It reassures or settles a matter with a light tone.
Examples
你放心,我小心点就是了。
Nǐ fàngxīn, wǒ xiǎoxīn diǎn jiù shì le.
Don't worry, I'll just be careful, that's all.
有事叫我一声就是了。
Yǒu shì jiào wǒ yì shēng jiù shì le.
If anything comes up, just give me a shout.
不够我再买就是了。
Bú gòu wǒ zài mǎi jiù shì le.
If it's not enough I'll just buy more, no big deal.
Related

See it in a story
In the app, X就是了 is underlined wherever it appears in the stories you read, and practised with sentences from them. Free.