只有.....才
Zhǐ yǒu....cái
Only if....then

我们只有现在离开，<strike>我们</strike>才能按时到达。
Wǒmen zhǐ yǒu xiànzài líkāi，wǒmem cái néng ànshí dàodá.
We can only arrive on time if we leave now.

你只有<strike>能</strike>努力学习<strike>才</strike>大学才能毕业<strike>了</strike>。
Nǐ zhǐyǒu néng nǔlì xuéxí cái dàxué bì yè le.
You can only graduate from university if you study hard.

只有你知道问题的答案，<strike>才</strike>问题才是容易的。
Zhǐ yǒu nǐ zhìdao wèntí, cái wèntí shì rōngyì de.
The question is only easy if you know the answer.

又.....又
Yòu....yòu
Both.....and

这位男儿又<strike>短</strike>矮又胖。
Zhè wèi nán'r yòu duǎn yòu pàng.
This name is both short and fat.

这座平房又旧又小。它也不太<strike>舒服</strike>舒适<strike>了</strike>。
Zhè zuò píngfáng yòu jìu yòu xiǎo. Tā yě bù tài shūfu.

既然.....就/也/那
Jìrán....jìu/yě/nà
Since.....then

既然你全天在家里，你就能洗碗碟吧。
Jìrán nǐ quántiān zài jiālǐ, nǐ jiù néng xǐ wǎn dié ba.
Since you're at home all day, you can do tje washing up.

既然我女朋友不吃肉，我们就一起通常只吃素菜。(This one is not suitable.既然——＞因为 may be better. )
Jìrán wǒ nǚ péngyou bù chī ròu, wǒmen jiù yī qǐ tōngcháng zhǐ chī sùcài.
Since my girlfriend doesn't eat meat, we usually just eat vegetable dishes together.

既然他是穆斯林，他也不吃猪肉。(既然——＞因为 may be better.)
Jìrán tā shì mùsīlín, tā yě bù chī zhūròu.
Since he's a Muslim, he doesn't eat pork.