What are the key temporal expressions used in German to indicate past, present, and future events?
To indicate past events in German, expressions like "gestern" (yesterday) and "letzte Woche" (last week) are used. For present events, phrases such as "heute" (today) and "jetzt" (now) are common. To denote future events, terms like "morgen" (tomorrow) and "nächste Woche" (next week) are typical.
How can one correctly use 'seit' and 'vor' to express time durations in German?
In German, "seit" is used to express a period beginning in the past and continuing to the present, equating to "since" or "for" (e.g., "Ich lerne Deutsch seit zwei Jahren" - "I have been learning German for two years"). "Vor" indicates a period of time prior to now, similar to "ago" (e.g., "Ich zog vor drei Jahren um" - "I moved three years ago").
How do you differentiate between 'nach' and 'nachdem' when expressing time in German?
In German, "nach" is used to mean 'after' in a general temporal sense, while "nachdem" is specifically a conjunction used to connect two clauses, meaning 'after' in the sense of a sequence of actions. "Nach" typically precedes time expressions, and "nachdem" introduces a subordinate clause.
What are the rules for using 'gestern', 'heute', and 'morgen' to describe events in the past, present, and future in German?
In German, 'gestern' refers to the past day (yesterday), 'heute' to the current day (today), and 'morgen' to the day after the current day (tomorrow). To describe events, use 'gestern' for actions that occurred yesterday, 'heute' for actions happening today, and 'morgen' for actions planned or expected to occur tomorrow.
How does one properly utilise 'während' and 'wenn' in German to describe actions occurring at specific times?
"Während" is used to express that something happens during the same time as something else ("during"), indicating a parallel action. "Wenn" is used for conditions ("if") or repeated actions in the past ("whenever"), but can also mean "when" for conditional or habitual actions.