Я иду в поликлинику вечером.

I am going to the clinic in the evening.

Breakdown of Я иду в поликлинику вечером.

• я: I
• в: to
• идти: to go
• вечером: in the evening

Questions & Answers about Я иду в поликлинику вечером.

Why is it иду and not хожу or пойду?

Russian has several verbs for “to go (on foot)”, and they are not interchangeable:

• идти → иду = to go / to be going (on foot) right now or one specific time
• ходить → хожу = to go (on foot) regularly, habitually, back and forth
• пойти → пойду = to set off / to start going (on foot), one-time, future-looking

So:

• Я иду в поликлинику вечером.
  Focus: this specific occasion (“I’m going / I’m on my way this evening”).

• Я хожу в поликлинику вечером.
  Focus: habit (“I (usually/regularly) go to the clinic in the evenings”).

• Я пойду в поликлинику вечером.
  Focus: decision / plan to start going at that time (“I will go / I’ll set off to the clinic in the evening”).

The original sentence talks about one specific trip (tonight or some evening already decided), so иду is natural.

Does иду mean I am walking, or can it also mean I’m going by bus/car?