Wenn meine Mutter auf der Schreibmaschine getippt hat, hat sie den Brief danach zum Briefkasten gebracht.

Questions & Answers about Wenn meine Mutter auf der Schreibmaschine getippt hat, hat sie den Brief danach zum Briefkasten gebracht.

Wait, isn't als used for 'when' in the past? Why does this sentence use wenn?
You are right that als is used for the past, but only for single, one-time events (like 'when I was a child'). This sentence uses wenn because it describes a repeated or habitual action in the past. Here, wenn really means 'whenever'.
Why does the second half of the sentence start with hat sie instead of sie hat?
The first part of the sentence (Wenn meine Mutter... getippt hat) is a subordinate clause that takes up the entire first position of the sentence. Because the verb in a main clause must always sit in the second position, the second half has to start right away with the verb hat. This creates the common verb-comma-verb pattern you see here: ...getippt hat, hat sie...
Why do we use the dative case in auf der Schreibmaschine?
The preposition auf is a two-way preposition. It takes the dative case (der for feminine nouns) when it describes a fixed location rather than a movement towards a destination. The mother isn't moving onto the typewriter; the action of typing is just happening on it.
Why is it zum Briefkasten?
The word zum is a contraction of zu (to) and dem (the). The preposition zu always forces the following noun into the dative case. Because Briefkasten is a masculine noun (der Briefkasten), 'to the' becomes zu dem, which is naturally shortened to zum.

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