Новая грамматическая тема: конструкция «лишь бы» выражает условие, которое для говорящего важнее всего.

Often, yes — but not always.

The core meaning is: this is the one condition that matters most to the speaker. Depending on context, natural English might be:

• as long as
• so long as
• provided that
• if only
• the main thing is that

Examples:

• Лишь бы он пришёл. → As long as he comes.
• Лишь бы не было дождя. → As long as it doesn’t rain.
• Лишь бы успеть! → If only we make it in time!

So as long as is often a good translation, but not the only one.

Если is a neutral if. It simply introduces a condition.

Лишь бы adds the speaker’s attitude: this is the minimum requirement, the key condition, or the only thing I really care about.

Compare:

• Если он придёт, мы начнём.
  If he comes, we’ll start.
  → neutral condition

• Лишь бы он пришёл.
  As long as he comes. / If only he comes.
  → the speaker especially wants that condition to be met

So лишь бы is more emotional or subjective.

No, you normally do not add another бы.

Лишь бы is a fixed construction. The particle бы is already part of it, so the verb usually appears without a second бы.

Correct:

• Лишь бы он пришёл.
• Лишь бы было тихо.

Not standard:

• Лишь бы он пришёл бы.

So it is best to learn лишь бы as one unit.

Most often, you see:

• a past-tense form of the verb
• or an infinitive

Examples with past-tense forms:

• Лишь бы он успел.
• Лишь бы было тепло.
• Лишь бы дети были здоровы.

Example with an infinitive:

• Лишь бы не опоздать.

Important: the past tense here does not necessarily mean past time. In this construction, it often refers to a hoped-for or desired situation, including the future.

Yes, very often.

This is especially common when the subject is general or obvious from context.

Examples:

• Лишь бы успеть.
  If only I/we can make it in time.

• Лишь бы не забыть.
  As long as I don’t forget.

• Лишь бы выжить.
  Just to survive / If only we survive.

This gives a compact, natural Russian structure.

Yes — and that is very common.

Лишь бы не... means that the speaker mainly wants to avoid something.

Examples:

• Лишь бы не было дождя.
  As long as it doesn’t rain.

• Лишь бы не опоздать.
  As long as we’re not late.

• Лишь бы он не заболел.
  As long as he doesn’t get sick.

So learners should get used to seeing лишь бы не... very often.

It can go either:

• after the main clause
• or before it

Examples:

• Я согласен, лишь бы цена не выросла.
  I agree, as long as the price doesn’t go up.

• Лишь бы цена не выросла, я согласен.
  As long as the price doesn’t go up, I agree.

If лишь бы introduces a subordinate clause in a full sentence, you normally use a comma.

But if it is a short standalone phrase, there may be no comma:

• Лишь бы успеть!

Because которое refers to условие, and условие is:

• neuter
• singular

The relative pronoun must agree with the noun it refers to.

So:

• условие → которое
• вопрос → который
• тема → которая
• условия → которые

In the sentence:

• ...выражает условие, которое для говорящего важнее всего

the word которое means which, and it matches условие.

Важнее is the comparative form of важный:

• важный = important
• важнее = more important

Всего here means something like of all or than everything else.

So важнее всего literally means:

• more important than everything else

In natural English, that often becomes:

• most important
• more important than anything else

So in this sentence:

• условие, которое для говорящего важнее всего

the meaning is:

• the condition that matters most to the speaker

Why not самое важное?
That would also be possible in many contexts, but важнее всего emphasizes comparison more strongly.

It is mostly neutral conversational Russian.

That means:

• very common in speech
• natural in informal writing
• also acceptable in normal written Russian

It is not slang, but it can sound more personal and emotionally colored than a dry logical connector.

In very formal or academic language, speakers may choose more neutral phrasing, depending on the style.

They are very close, and in many sentences they can be translated the same way.

Examples:

• Лишь бы успеть!
• Только бы успеть!

Both can mean If only we make it in time!

But there is often a slight nuance:

• только бы can sound a bit more emotional, anxious, or like a strong wish
• лишь бы often highlights that this one condition is enough, and the rest is secondary

Compare:

• Мне всё равно, лишь бы было тихо.
  I don’t care, as long as it’s quiet.

This sounds like: quiet is the only thing that matters.

So they overlap a lot, but are not always identical in tone.

In the grammar point you were given, it expresses a condition that matters most to the speaker.

But in real Russian, лишь бы can also appear in a slightly different pattern meaning something like:

• all someone cares about is...
• someone just wants to...

For example:

• Ему лишь бы спорить.
  All he wants to do is argue.

• Им лишь бы деньги.
  All they care about is money.

This is related to the same core idea: one thing dominates everything else.

So the lesson’s definition is correct, but it is useful to know that the expression can have a broader use in everyday Russian.