学语言不容易，很难一下就完全学会。

Xué yǔyán bù róngyì, hěn nán yíxià jiù wánquán xuéhuì.

Studying language is not easy; it's very difficult to learn all at once.

你可以帮我问一下吗？

Nǐ kěyǐ bāng wǒ wèn yíxià ma?

Do you mind asking for me real quick?

你试一下这条裙子合不合穿。

Nǐ shì yíxià zhè tiáo qúnzi hébùhé chuān.

Try this skirt on real quick and see if it is suitable.