By Richard NordquistUpdated March 28, 2019Original Website[https://www.t...
一般过去时 Past Simple Tense “Used to” is for describing things that happened...
Most English verbs form their past and past participle by adding –d or –...
Present Simple Tense #语法 #词法 一般现在时可以用来表示现在的状态,习惯性、经常性的动作和事件,客观事实及普遍真理。 P...
If it is improperly introduced into the environment, acid-whey runoff ca...
破折号Dash Em dash The em dash is perhaps the most versatile punctuation ma...
连字符Hyphen A hyphen (-) is a punctuation mark that’s used to join words o...
分号Semicolon The semicolon is sometimes described as stronger than a comm...
冒号 Colon Colons can be confusing, that's true, but their function is act...