句式: Subject + Verb + Object
She (主詞) suggested (動詞) going for a walk (受詞).
going 作為動名詞/活動。
直述句式: Subject + transitive verb + direct object + indirect object
* 這種句式,直接受詞和簡接受詞之間要有 to 或 for。
Someone (主詞) suggests (動詞) her (直接受詞) to go for a walk (簡接受詞).
被動句式: Subject (主詞) + BE + Past Participle (過去分詞) + ... [by ~]
所以變成: She (主詞) is (BE) suggested (過去分詞) to go for a walk [by someone].
She 雖是主詞,但她是被提議的。而 by~ 是可以不提的。