Past Tense verbs are formed :

1. by adding suffix -л to the stem of infinitive: шить -шил (to saw-sawn)
   
2. by changing form altogether: идти - шел (to go - went)
   

Suffix -л could be omitted in some forms of masculine gender (zero suffix):

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1.	If the stem of infinitive ends with -ере or a consonant	расти -рос, стереть -стёр, залезть -залез	to grow -grew, to erase -erased, to get into - got into
2.	Verbs with suffix -ну- with meaning of gradual change to some state	сохнуть -сох, зависнуть- завис	to get dry - got dry, to freeze - froze

 

The past tense verbs are modified by gender. They are not modefied by person.

In colloquial Russian some verbs could be used in the imperative mood:

Так пошел купил хлеба! (Go and buy bread now!)

Ну-ка пошел отсюда, я кому сказал? (Go away, i'm talking to you!)

 

Some forms in the past could actually be used to express future and present:

Ну все я поехал! (Alright then I'm gone!) Мы пошли, ты с нами? (We're going, are you with us?)