"You are drinking this milk."

Translation: Du trinkst diese Milch.

[carole401419]

why not dieses milch?

[ZuMako8_Momo]

Because „milch“ is feminine; the ending of „diese“ (final „-e“) has to match the ending of the feminine definite article „die [Milch]“. You use „dieses“ for neuter nouns, such as „das Gemüse“.

[DeborahBak11]

Can das be substituted for diese as "this"