The structure 该…就得… and 该…还得…
The structure 该…就得… 
and 该…还得… emphasize that an action should take place as originally planned, and that other factors shouldn’t influence it.
In the structure, both ellipses are replaced with the same combination of a verb and a noun.
and 该…还得… emphasize that an action should take place as originally planned, and that other factors shouldn’t influence it.
In the structure, both ellipses are replaced with the same combination of a verb and a noun.Scheme
该
verb and noun
还/就
verb and noun
Examples
该学汉语还得学汉语
You still have to learn Chinese
gāi xué hànyǔ hái děi xué hànyǔ
在中国过年商店最忙了，哪儿有假呀，该开门就得开门
Stores in China are busiest during the New Year celebration. They work without any days off
zài zhōngguó guònián shāngdiàn zuì máng le, nǎr yǒu jiǎ ya, gāi kāimén jiù děi kāimén
就得 and 还得 can be omitted.
Scheme
该
verb and noun
verb and noun
Examples
已经决定了吧，该打球打球
So, we decided to play ball anyway
yǐjīng juédìng le ba, gāi dǎqiú dǎqiú
不管是否和平年代，人们还是该恋爱恋爱，该结婚结婚
Whether in times of war or times of peace, people will still fall in love and get married
bùguǎn shìfǒu hépíng niándài, rénmen háishì gāi liàn'ài liàn'ài, gāi jiéhūn jiéhūn
This structure can be cut even more, leaving only a verb.
Scheme
该
verb
verb
Examples
工作忙的时候我会忘记吃饭，但是到了中午，该吃吃
Even though I should eat at lunchtime, I sometimes forget to eat when I am busy with work
gōngzuò máng de shíhòu wǒ huì wàngjì chīfàn, dànshì dào le zhōngwǔ, gāi chī chī
不管他怎么说，该干嘛干嘛
It doesn’t matter what he says. You have to do what you have to do
bùguǎn tā zěnme shuō, gāi gàn má gàn má
还 can be used instead of 就得 or 还得 .
In this case, 该 and 还 are followed by either a verb with a noun or just a noun.
can be used instead of 就得 or 还得 .
In this case, 该 and 还 are followed by either a verb with a noun or just a noun.Scheme
该
verb and noun
还
verb and noun
Examples
哭没有用，该是什么结果还是什么结果
Crying won’t change a thing. The result will still be the same
kū méiyǒu yòng, gāi shì shénme jiéguǒ hái shì shénme jiéguǒ