Если тебе удобно, я перезвоню попозже и всё объясню.

Literally, Если тебе удобно is something like If to-you it-is convenient / comfortable.

Russian often leaves out a dummy subject like English it. In English we say If it’s convenient for you, but in Russian the idea is expressed without an explicit subject:

• тебе = for you / to you
• удобно = convenient, comfortable

So the structure is very natural in Russian even though it feels incomplete from an English point of view.

Because удобно in this kind of sentence takes the person experiencing the situation in the dative.

This is a very common Russian pattern with words expressing states, feelings, or evaluations:

• мне удобно = it’s convenient for me
• ему трудно = it’s hard for him
• нам интересно = it’s interesting to us

So тебе is not the subject. It means for you or to you, which is why it is dative.

Here удобно is not really an ordinary adverb meaning conveniently. It functions as a predicative word, expressing a state or condition: it is convenient.

Compare:

• Мне удобно. = It’s convenient for me.
• Он удобно сидит. = He is sitting comfortably.

In your sentence, удобно means a state: whether the timing/situation works for the other person.

Normally, no.

Ты удобен would sound strange here because удобен describes a person or thing as convenient in a more literal or unusual sense. It does not mean if it’s convenient for you.

The natural Russian expression is:

• Если тебе удобно = If it’s convenient for you

This is the standard phrase to use when asking whether something suits someone.

Перезвоню means I’ll call back or I’ll call again, while позвоню just means I’ll call.

So:

• я позвоню = I’ll call
• я перезвоню = I’ll call back / I’ll ring again later

In this sentence, перезвоню suggests that there has already been contact, or that the speaker is continuing an earlier conversation by calling again later.

It is future tense.

Russian perfective verbs form the future with what looks like present-tense endings. Перезвонить is perfective, so:

• я перезвоню = I will call back

This is different from imperfective verbs, which make the future with быть:

• я буду звонить = I will be calling / I will call repeatedly

So перезвоню is a normal perfective future form.

Both mean later, but попозже is a softer, slightly less exact version, often like a bit later or somewhat later.

• позже = later
• попозже = a little later / somewhat later

In conversation, попозже often sounds more natural and less abrupt. It can feel a bit friendlier or more tentative.

Because Если тебе удобно is a subordinate clause introduced by если.

Russian separates that clause from the main clause with a comma:

• Если тебе удобно, я перезвоню попозже...

This is like English If it’s convenient for you, I’ll call back later...

Russian comma rules with subordinate clauses are quite strict, so the comma is required here.

Because всё means everything, while все means all people or everyone, or all in plural contexts.

Here the speaker means I’ll explain everything, so:

• всё объясню = I’ll explain everything

Compare:

• всё = everything
• все = everyone / all people / all plural items

Also, the ё matters for pronunciation and meaning here.

It can be omitted because it is obvious from context.

In English we often say I’ll explain everything to you, but in Russian the recipient is frequently left out if it is clear. So:

• я всё объясню = I’ll explain everything
• я тебе всё объясню = I’ll explain everything to you

Both are possible. The version without the second тебе is perfectly natural because the person being addressed is already obvious.

Yes, often it can.

Russian verb endings usually show the subject clearly, and перезвоню already means I will call back, so я is not strictly necessary:

• Если тебе удобно, перезвоню попозже и всё объясню.

That said, я is also completely natural. Speakers may include it for clarity, rhythm, or slight emphasis.

The word order is fairly flexible, although the original version is very natural.

The given order:

• Если тебе удобно, я перезвоню попозже и всё объясню.

sounds neutral and smooth.

Possible variations include:

• Если тебе удобно, я попозже перезвоню и всё объясню.
• Я перезвоню попозже и всё объясню, если тебе удобно.

The meaning stays close, but the focus shifts slightly. Russian word order often changes emphasis more than basic meaning.

Yes. Тебе is informal singular you.

For formal you or plural you, use вам:

• Если вам удобно, я перезвоню попозже и всё объясню.

That is the polite/formal version.

So the contrast is:

• тебе = to you, informal singular
• вам = to you, formal singular or plural

This is a very important distinction in Russian conversation.