Notes

Question 1

Prepositions with temporal meaning in the dative case

Vor vielen Jahren ( many yrs ago)
Nach (after)
Von...bis. (From .... Until, to)
Zwischen ( between)
In ( future) in einem Jahr

Answer 1

If an activity started in the past and continues presently, use seit.

To indicate a time period contained only in the past, do not use Für…put the expression in accusative:
Ich war eine Woche (long) in Berlin.

Question 2

Time and dates are usually placed right after the verb.

I go home around 6 pm.

Answer 2

Ich gehe um 6 Uhr abends nach Hause.

Question 3

Nomen mit Bensonderen formen

Masculine nouns in the dative/ akk case take an -n or -en

Except in the nominative

Answer 3

Der Junge. Dem, Den Jungen
Des Jungen

Die jungen