lǎo / shī / ràng / wǒ / men / xiě / chū / yī / pǔ / xī / lóng / de / dà / xiě / hé / xiǎo / xiě / xíng / shì老师让我们写出伊普西隆的大写和小写形式。The teacher asked us to write the uppercase and lowercase forms of epsilon.