What is the difference between "pójść" and "iść"?
pójść and iść means to go. pójść is perfective of the verb to go when used in the past and in the future. eg. in The past: Poszedłem do szkoły (I went to school) eg. in The future: Pójdę do szkoły ( I will go to school)
iść is infinitive of a verb to go and it's used in the present. eg. Idę do szkoły(I'm going to school) if you want to say I go to school then you use a verb chodzić (Chodzę do szkoły)
Perfective verbs(including "pójść") have only past tense and future tense, but imperfective verbs (including "iść") have past tense, present tense and future tense.
eg. Idę do szkoły(I'm going to school) if you want to say I go to school then you use a verb chodzić (Chodzę do szkoły)
To make it more clear I would say:
Idę do szkoły - I'm (now) going to school
Chodzę do szkoły - I go to school (regularly)
If iść has a past and future tense, when would it be better to use those forms rather than the past and future tenses of pójść?
When you focus on the process of going rather than the 'completeness' of it.
So more or less like "I was going to school" vs "I went to school".