E. When the verb takes a series of unquantified objects.

 

Zuótiān wǒ kàn-le yǔfǎ, xiě-le Hanzi, tīng-le lùyīn, hái bèi-le duìhuà.  

昨天我看了语法，写了汉字，听了录音，还背了对话。

          Yesterday I read the grammar, wrote the characters, listened to the recording and memorized the dialogues.