Polly Lingual
祈使语气
Imperative Mood
开始上课
刽子手
短语
Phrases
Pass me the ball.
动词变化
Verb Conjugations
非有限
non-finite
动词不定式
infinitive
过去分词
past participle
动名词
gerund
指示
indicative
当前
present
过去
preterite
势在必行
imperative
势在必行
imperative
Related Lessons
现在时态
Present Tense
社交礼仪
Social Etiquette
义务
Obligations
Simple Past Tense (Irregular Verbs)
Simple Past Tense (Regular Verbs)
课程
Courses
中级
Intermediate
语法
Grammar
更换语言：
French
Spanish
English
Italian
German
Portuguese
Chinese