Я часто езжу по городу на трамвае.

I often ride around the city by tram.

Breakdown of Я часто езжу по городу на трамвае.

• я: I
• город: the city
• на: by
• часто: often
• ездить: to ride
• трамвай: the tram
• по: around/through

Questions & Answers about Я часто езжу по городу на трамвае.

Why is the verb езжу used here, and what infinitive is it from?

Езжу is the 1st person singular present of ездить (я езжу).
Ездить is an imperfective, multidirectional verb of motion, commonly used for:

• habitual/repeated trips (I often go / I often ride)
• going around in different directions, not one single “one-way” trip

So with часто (often), я часто езжу… is the natural choice.

What’s the difference between ездить and ехать?

• ехать (я еду) = typically one конкретный trip right now / one direction: I’m going (now), I’m riding (now).
• ездить (я езжу) = habitual/repeated / general ability / multidirectional: I go (often/in general).

So:

• Я часто езжу по городу… = I often travel around the city…
• Я еду по городу… = I’m going through/around the city (right now)…

Why is it по городу and not в городе?

They’re different ideas:

• по городу = around/through the city, moving within it in various places (the city as an area you travel around)
• в городе = in the city as a location (more static, or just stating where something happens)

Compare:

• Я часто езжу по городу. = I often get around the city.
• Я часто езжу в городе. = I often ride/drive in the city (less natural; you’d usually specify where to or use по).

What case is городу, and why?

городу is dative singular of город.
The preposition по often takes the dative when it means around/through/within an area:

• по городу (around the city)
• по улице (along the street)
• по парку (around the park)

Why is it на трамвае—doesn’t на mean “on top of”?

With transport, на + prepositional is a standard way to mean by (means of):

• на трамвае = by tram
• на автобусе = by bus
• на метро = by metro

It’s not literally “on top of”; it’s just the idiomatic Russian pattern for many vehicles.

What case is трамвае, and why is it not instrumental?

трамвае is prepositional singular (местный/предложный) of трамвай because it follows на in the “location/means” pattern на + prepositional:

• на трамвае
• на автобусе
• на поезде

Instrumental is used in other “by means of” contexts too, but vehicles commonly use на/в + prepositional rather than instrumental.

When would I say в трамвае instead of на трамвае?

• на трамвае = by tram (focus: method of transport)
• в трамвае = in the tram (focus: inside it / location)

Examples:

• Я часто езжу по городу на трамвае. = I often get around by tram.
• Я часто читаю в трамвае. = I often read in the tram.

Can I drop Я? Do Russians always say the subject?

Yes, you can often omit it because the verb ending shows the person:

• Часто езжу по городу на трамвае. = (I) often ride around the city by tram.

You include я for emphasis/contrast, e.g. Я часто езжу…, but он rarely does.

Is the word order fixed? Could I move часто or the phrases?

Russian word order is flexible, but it changes emphasis:

• Я часто езжу по городу на трамвае. = neutral
• Я по городу часто езжу на трамвае. = emphasizes around the city
• На трамвае я часто езжу по городу. = emphasizes by tram

The most neutral is usually: subject + adverb + verb + place + transport.

How do I pronounce езжу and where is the stress?

Stress: езжу́ (ending stressed).
Pronunciation notes:

• жж is like a long zh sound (as in measure, but longer): [ж:]
• я часто езжу́ flows together in speech.

What does часто do grammatically—does it change form?

часто is an adverb meaning often. It does not decline (no gender/case/number forms). It typically modifies the verb:

• часто езжу = go/ride often

Could I use another verb instead of ездить?

Sometimes, depending on meaning:

• Я часто катаюсь по городу на трамвае. = sounds like “I often ride around for fun” (more leisurely)
• Я часто езжу по городу на трамвае. = neutral, practical “I often travel/get around”

So ездить is the best general choice here.