Не то чтобы папа сердился, но он начал ворчать, когда никто не убрал обувь у двери.

Не то чтобы is a set expression meaning something like:

• It’s not exactly that...
• Not that...
• It’s not really that...

It softens what follows. In this sentence, the speaker is saying:

• Dad was not really angry
• but he did start grumbling

So Не то чтобы папа сердился does not completely deny anger; it just says that angry is not quite the best description.

Сердился is the past tense of the imperfective verb сердиться = to be angry / to get upset in an ongoing or general sense.

Here, the sentence is describing Dad’s state, not a single completed moment of becoming angry. That is why сердился works well.

Compare:

• папа сердился = Dad was angry / was upset
• папа рассердился = Dad got angry / became angry

Because the speaker is saying it wasn’t really that he was angry, the imperfective сердился sounds natural.

Папа is grammatically masculine, even though it ends in -а.

A number of Russian words for male people have this pattern, for example:

• папа
• дядя
• дедушка
• мужчина

So you say:

• папа сердился
• папа начал
• папа устал

not feminine forms.

The ending looks feminine, but the meaning and agreement are masculine.

They are related, but not the same.

• сердиться = to be angry, annoyed, upset
• ворчать = to grumble, complain under one’s breath, mutter in annoyance

So the sentence contrasts two ideas:

• Dad was not exactly angry
• but he did start grumbling

That makes the tone more natural and nuanced. He may have been irritated, but not seriously mad.

Начал ворчать means started grumbling. It focuses on the beginning of the action.

• он ворчал = he was grumbling / he grumbled
• он начал ворчать = he started grumbling

In this sentence, that helps show the reaction to what happened: nobody put the shoes away, and then Dad began to grumble.

This is very common in Russian:

• начал говорить = started talking
• начал смеяться = started laughing
• начал работать = started working

Russian normally uses double negation. If the subject is negative, the verb is negative too.

So Russian says:

• никто не знает = nobody knows
• ничего не вижу = I don’t see anything
• никто не убрал обувь = nobody put the shoes away

This is required in standard Russian. You cannot normally say никто убрал.

Никто is grammatically singular, even though in meaning it refers to no person / nobody.

That is why the verb is singular:

• никто не пришёл = nobody came
• никто не сказал = nobody said
• никто не убрал = nobody put away

In the past tense, Russian often uses masculine singular as the default form when the specific person is unknown or general.

Here Russian uses the perfective verb убрать in the past tense: убрал.

That suggests a completed action:

• убрал обувь = put the shoes away / removed the shoes from where they should not be

If you used убирал, it would sound more like an ongoing or repeated process, which is not the point here.

The sentence is about a simple result that did not happen:

• nobody put away the shoes

So the perfective is natural.

Literally, убрать can mean remove, put away, tidy away, or clear away, depending on context.

So никто не убрал обувь у двери means that the shoes were left by the door instead of being put where they belonged.

It does not necessarily mean throwing them away or taking them far away. It usually means something like:

• no one put the shoes away
• no one cleared the shoes from the doorway area

In Russian, обувь is a singular collective noun meaning footwear.

So grammatically it is singular, even though in English we often translate it with a plural word:

• обувь = footwear / shoes

This is normal Russian usage. You could also mention specific items, like:

• ботинки = boots
• кроссовки = sneakers
• туфли = shoes

But обувь is a general word for footwear as a category.

У двери means by the door or near the door.

The preposition у usually requires the genitive case, so:

• дверь → nominative
• у двери → genitive

This is a very common pattern:

• у окна = by the window
• у стены = by the wall
• у дома = by the house

So обувь у двери means the shoes were left near the door.

The first comma separates the two main parts of the sentence:

• Не то чтобы папа сердился
• но он начал ворчать...

The second comma introduces the clause with когда:

• когда никто не убрал обувь у двери = when nobody put the shoes away by the door

Russian uses commas before conjunctions like но and before subordinate clauses introduced by words like когда, что, если, потому что, and so on.

Yes, Russian word order is fairly flexible, though each version may sound slightly different in emphasis.

The original order is very natural:

• Не то чтобы папа сердился, но он начал ворчать, когда никто не убрал обувь у двери.

You could also hear:

• Когда никто не убрал обувь у двери, он начал ворчать.
• Обувь у двери никто не убрал, и папа начал ворчать.

But the original version is good because it first gives the nuance:

• he was not exactly angry, and then gives the reaction:
• he started grumbling.