ići

See also: ici, ICI, -ici, and içi

Serbo-Croatian

ìći impf (Cyrillic spelling ѝћи)

(intransitive) to go, walk
(intransitive) to flow, run, leak (of liquid)
(intransitive) to function, work (of a machine)
(intransitive, dative) to do well, succeed
(intransitive) to elapse, pass (of time or period)
(intransitive) to belong to, classify as
(intransitive) to suit, fit
(auxiliary, informal) Forms a near future tense, akin to English going to future tense construction.
Gladan sam. Idem jesti! ― I am hungry. I'm gonna go eat! (literally, “I am hungry. I go eat!”)

Umorio sam se! Idem odmoriti. ― I am exhausted. I'm gonna go rest! (literally, “I am tired. I go rest!”)

Ideš li na koncert sutra? Svi idu! ― Are you going to the concert tomorrow? Everyone is gonna go! (literally, “Are you going to the concert tomorrow? Everyone goes!”)
(auxiliary, informal) Forms a past progressive tense that entails an inchoate future aspect.
Išao sam pokositi travu u vrtu, ali je počela padati kiša. (Croatia)
Išao sam da pokosim travu u vrtu, ali je kiša počela da pada. (Bosnia, Serbia, Montenegro) ― I was going to mow the lawn, but it started raining. (literally, “I went to mown the lawn, but it started raining.”)

By definition, ići implies movement; it is usually translated as "going to go/gonna go", indicating a planned action or intention or a suggestion that is to take place or be done soon.
Ići is an imperfective verb, therefore it matches the function of English's progressive aspect. The verb is followed by the action verb in either infinitive (Croatia) or present form (Serbia, Bosnia and Herzegovina, Montenegro). Action verb can be omitted if it is deducible from context:

"Jesi li pokosio travu? Ne, išao sam, ali počela je padati kiša."

"Did you cut the grass? No, I was going to, but it started raining."

Since aorist and imperfect have become obsolete in many Serbo-Croatian dialects and supplanted in function by past perfect, the form of the tense matches the past perfect construction. Therefore, the sentence "Išao sam." could be translated as either "I went." or "I was going." depending on context.
The future formed with "ići" is usually reserved for informal situations and actively avoided in formal ones in both speech and writing where simple future tense would be used; i.e "Hoćete li ići na koncert?" ("Will you be going/go to the concert?") instead of "Idete na koncert?" ("You gonna go to the concert?)

Conjugation of ići

Infinitive: ići		Present verbal adverb: ȉdūći		Past verbal adverb: ȉšāvši		Verbal noun: ìdēnje
Number		Singular			Plural
Person		1st	2nd	3rd	1st	2nd	3rd
Verbal forms		ja	ti	on / ona / ono	mi	vi	oni / one / ona
Present		idem	ideš	ide	idemo	idete	idu
Future	Future I	ići ću	ići ćeš	ići će	ići ćemo	ići ćete	ići će
Future	Future II	bȕdēm išao²	bȕdēš išao²	bȕdē išao²	bȕdēmo išli²	bȕdēte išli²	bȕdū išli²
Past	Perfect	išao sam²	išao si²	išao je²	išli smo²	išli ste²	išli su²
	Pluperfect³	bȉo sam išao²	bȉo si išao²	bȉo je išao²	bíli smo išli²	bíli ste išli²	bíli su išli²
	Imperfect	iđah	iđaše	iđaše	iđasmo	iđaste	iđahu
Conditional I		išao bih²	išao bi²	išao bi²	išli bismo²	išli biste²	išli bi²
Conditional II⁴		bȉo bih išao²	bȉo bi išao²	bȉo bi išao²	bíli bismo išli²	bíli biste išli²	bíli bi išli²
Imperative		—	idi	—	idimo	idite	—
Active past participle		išao m / išla f / išlo n			išli m / išle f / išla n
¹ Croatian spelling: others omit the infinitive suffix completely and bind the clitic. ² For masculine nouns; a feminine or neuter agent would use the feminine and neuter gender forms of the active past participle and auxiliary verb, respectively.