De când stăm aici, vecina ne aduce flori primăvara.

Here de când means since or ever since.

So:

• De când stăm aici = Since we have been here / Ever since we started living here

In other contexts, de când? can also be a question meaning since when?, but in this sentence it introduces a time clause.

Romanian often uses the present tense for something that started in the past and is still true now.

So:

• De când stăm aici literally = Since we stay/live here
• natural English = Since we’ve been living here or Ever since we moved here

This is a very common difference from English. English often uses a present perfect or present perfect continuous, while Romanian can simply use the present.

Yes. A sta is a very flexible verb.

It can mean:

• to sit
• to stay
• to remain
• to live / reside in some contexts

In stăm aici, it means we live here or we’ve been staying/living here.

Romanian also has a locui, which more directly means to live, to reside. So you could also say:

• De când locuim aici...

That would sound slightly more explicitly about residence, while a sta is very common in everyday speech.

Vecina means the neighbor.

Romanian usually puts the definite article at the end of the noun:

• vecină = a neighbor
• vecina = the neighbor

So the sentence is talking about a specific neighbor already identifiable in context:

• vecina = the (female) neighbor

Because vecină is feminine singular, the definite article becomes -a.

Ne is the unstressed pronoun meaning to us or us, depending on the verb.

Here it is an indirect object:

• vecina ne aduce flori = the neighbor brings us flowers

Romanian usually places these short object pronouns before the verb:

• îmi aduce = brings me
• îți aduce = brings you
• ne aduce = brings us

So ne is not optional if you want to say who receives the flowers.

The Romanian present tense can cover both:

• brings
• is bringing

The exact meaning depends on context.

In this sentence, because of primăvara and the overall sense, it describes a habitual/repeated action:

• vecina ne aduce flori primăvara = the neighbor brings us flowers in spring / every spring

So here aduce is best understood as a habitual present, not an action happening right this second.

Because it means flowers in a general, indefinite sense.

• flori = flowers / some flowers
• florile = the flowers

Here the meaning is not about a specific known set of flowers, but simply that the neighbor brings flowers. So Romanian uses the bare plural:

• ne aduce flori = brings us flowers

This works much like English brings us flowers, not brings us the flowers.

Primăvara means in spring or during spring.

This is one of those time expressions that often uses the form with the definite article:

• primăvara = in spring
• vara = in summer
• toamna = in autumn
• iarna = in winter

So although primăvară by itself is spring, the form primăvara is very commonly used adverbially to mean in the spring / during springtime.

In this sentence:

• vecina ne aduce flori primăvara = the neighbor brings us flowers in spring

Yes, Romanian word order is fairly flexible, but this version is the most neutral and natural.

Current order:

• vecina = subject
• ne = indirect object pronoun
• aduce = verb
• flori = direct object
• primăvara = time expression

You could move things around for emphasis, for example:

• Primăvara, vecina ne aduce flori.
• Flori ne aduce vecina primăvara.
  This is more marked and would sound more emphatic or stylistic.

So the original sentence is the straightforward, standard order.

Literally, it is closer to since we have been here / since we’ve been living here.

It does not literally say since we moved here, because Romanian would normally express that more directly with a verb like ne-am mutat:

• De când ne-am mutat aici... = Since we moved here...

But in many real contexts, De când stăm aici... can strongly imply the period beginning when the speakers started living there.

Most naturally, it suggests a repeated habit:

• Ever since we’ve been here, the neighbor brings us flowers in spring.

So the idea is usually each spring or whenever spring comes.

If Romanian wanted to emphasize a single completed past event, it would likely use a past tense instead, such as:

• vecina ne-a adus flori primăvara trecută = the neighbor brought us flowers last spring

But with aduce in the present, the sentence sounds habitual.

Because Romanian often uses short pronoun forms attached closely to the verb.

English says:

• brings flowers to us

Romanian usually says:

• ne aduce flori

Here ne already contains the meaning to us. Romanian does not need a separate preposition in this structure.

A fuller, more emphatic form is possible:

• nouă ne aduce flori

That would mean something like to us, she brings flowers or she brings flowers to us, with extra emphasis on us.

Yes: the sentence combines two present-tense ideas to describe an ongoing situation.

• De când stăm aici = a situation continuing up to now
• vecina ne aduce flori primăvara = a regular action that happens during that period

So the whole sentence has the sense of:

• Ever since we’ve lived here, the neighbor has been bringing us flowers every spring.

That combination of present forms is very natural in Romanian, even though English often uses more complex tense forms to express the same idea.