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.