Contractions

    Just as English uses contractions to combine two words together, German does the same thing but with different parts of speech. German combines prepositions with definite articles. Contractions occur when masculine and neuter definite articles in the dative case combine with five prepositions. Notice also that there is only one feminine definite article in the dative case. It forms a contraction with zu.

an dem	am
in dem	im
bei dem	beim
von dem	vom
zu dem	zum
zu der	zur

   Neuter definite articles in the accusative case also can form contractions with certain prepositions.

In German, an apostrophe is never needed in a contraction.

an das	ans
auf das	aufs
für das	fürs
in das	ins
um das	ums

  
  Although it is perfectly correct to use prepositions and definite articles in their full form, German sounds smoother and more normal with the use of contractions.

correct.	Sie spielen in dem Garten.	They play in the garden.
more normal.	Sie spielen im Garten.