M6U1Grammar and Usage
        Overview: infinitive, verb-ing & verb-ed (I)
非谓语动词
过去分词: v-ed
不定式: (to) do
v-ing 形式
动名词
现在分词
Review the general function of non-finite verbs (Tick√or×)
√
×
×
×
×
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√