我对花粉过敏，常常打喷嚏。

Wǒ duì huāfěn guòmǐn, chángcháng dǎ pēntì.

I'm allergic to pollen and often sneeze.

在公共场所打喷嚏时，请使用纸巾遮住口鼻。

Zài gōnggòng chǎngsuǒ dǎ pēntì shí, qǐng shǐyòng zhǐjīn zhēzhù kǒubí.

When sneezing in public, please use a tissue to cover your mouth and nose.

她对猫毛过敏，接近猫咪就会打喷嚏。

Tā duì māo máo guòmǐn, jiējìn māomī jiù huì dǎ pēntì.

She is allergic to cat hair and sneezes when near a cat.