一、陈述语气：陈述语气用于陈述事实、提出看法或问题等

You should be able to understand this.你应当能理解这一点。

She saw the president get off the plane.她看到总统走下飞机。

He was brought up by his aunt.他是由他姑姑带大的。

Latin is a classical language.拉丁语是一门古典语言。