TUTORIAL教程 08
Present an ongoing situation before a new event enters the narrative.先呈现持续的情境，再引入叙事中的新事件。
Useful preparation:学习准备：Who does what?谁做什么？
The soldiers were guarding the city. Then a messenger arrived.士兵们正在守卫城市。随后一位信使到达了。
Your Latin and Greek attempts save separately in this browser.拉丁语及希腊语尝试分别保存在本浏览器中。
If the download does not appear, copy this JSON and save it as a .json file.如未出现下载，可复制此 JSON 并保存为 .json 文件。
Mīlitēs urbem custōdiēbant. Tum nūntius vēnit.
These tense choices organize the telling. A perfect can summarize a long period; an imperfect can describe an action that eventually ends. Duration alone does not choose the tense.这些时态选择组织叙述。完成时可概括长时间；未完成时也可描写后来结束的行动。仅凭持续时长不能选定时态。
Tum orders the telling, but does not itself say that the guarding ceased or that the arrival caused a later action.Tum 安排叙述顺序，本身不表示守卫结束，也不表示到达造成了后续行动。
οἱ στρατιῶται τὴν πόλιν ἐφύλαττον. τότε ἄγγελος ἦλθεν.
The aorist does not mean momentary action in every use. Here it presents the arrival as an event. The imperfect keeps the guarding visible as background.不定过去时并非总表示瞬间行动。此处它把到达呈现为一个事件，未完成时则让守卫作为背景持续可见。
A different context can make a different tense sensible. Explain the viewpoint, rather than translating every English past tense by one Greek form.其他语境可能适合其他时态。应解释叙述视角，不把所有英语过去式都译成同一种希腊形式。
This is an authored example; other answers may preserve the intended meaning and fit the context.此为编写示例；其他答案也可能保留预期意义，并符合语境。
Present the guarding as one narrated past event.把守卫呈现为一项过去叙述事件。
Mīlitēs urbem custōdīvērunt.
The perfect summarizes guarding as an event, without requiring a short duration.完成时把守卫概括为事件，不要求时间短。
οἱ στρατιῶται τὴν πόλιν ἐφύλαξαν.
The aorist presents guarding as a whole event; it need not mean brief guarding.不定过去时把守卫呈现为整体，不必是短暂守卫。
Change the background and keep two sentences: the general was speaking. A messenger arrived.改变背景，保留两个句子：将军正在说话。一位信使到达。
Dux verba faciēbat. Nūntius vēnit.
The imperfect speech supplies the background to the arrival.未完成时的说话活动为到达事件提供背景。
ὁ στρατηγὸς ἔλεγε. ἄγγελος ἦλθεν.
The imperfect speech is presented as in progress, followed by the arrival event.未完成时把说话呈现为正在进行，随后写到达事件。
Describe a repeated routine: the soldiers often used to guard the city.描写反复常规：士兵们过去经常守卫城市。
Mīlitēs saepe urbem custōdiēbant.
The imperfect can present a repeated past practice.未完成时可呈现反复的过去惯例。
οἱ στρατιῶται πολλάκις τὴν πόλιν ἐφύλαττον.
The imperfect also suits a repeated practice; a summary in the aorist would present a different viewpoint.未完成时也适于反复惯例；用不定过去时概括会呈现另一视角。
Caesar, Bellum Gallicum · 1.6.1–1.6.2
Caesar, Bellum Gallicum · 1.7.1–1.7.2
Cicero, In Catilinam · 1.10
Xenophon, Anabasis · 1.1.1–1.1.3
Xenophon, Anabasis · 1.1.9–1.1.10
Original examples and explanations remain drafts pending independent language review.编写例答及解释仍为草案，等待独立语言审阅。
Choose one response to export as a Syntax Studio source. Only that text is included; reflections and model answers stay outside this export. Import and a composition fork remain explicit actions in Cursus.选择一项作答，导出为 Syntax Studio 的源文本。只包含所选文本，不含反思或例答。在 Cursus 中，导入及建立写作分支仍须明确操作。