In English 'drinks' is in the simple present and it shows a customary action whereas 'is drinking' shows an action taking place at the moment of speaking. In Sevenska 'dricker' can be translated 'drinks' and/or 'is drinking'. How/when do we differentiate between the two tenses in Svenska?
To put it simply: When it's in the present you will find 'er' in the ending of the word. If it's in the past it will have 'it' in it. Future will end with 'a'.
Drick'er' (drinking) present
Druck'it' (drank) past
Drick'a' (drink) future