1、(2) the case problems of both direct object and indirect object.
(2)直接賓語和間接賓語的格位問題。

2、Some verbs have two objects, a direct object and an indirect object.
一些動詞有兩個(gè)賓語：直接賓語和間接賓語。

3、the category of nouns serving as the direct object of a verb.
作為一個(gè)動詞的直接賓語的名詞范疇。

4、the category of nouns serving as the direct object of a verb
作為一個(gè)動詞的直接賓語的名詞范疇。

direct object翻譯