Dün kız kardeşim bana küstü, ama akşam yeniden konuşmaya başladık.

Küstü is the past tense of küsmek.

In this sentence, küsmek means something like:

• to get offended
• to be upset with someone
• to be cross with someone
• sometimes even to stop talking to someone because of hurt feelings

So bana küstü is not just she was sad. It specifically suggests that your sister was upset with you.

Because küsmek takes the dative case, not the direct object.

So:

• ben = I
• bana = to me
• beni = me

With küsmek, Turkish uses bana / sana / ona etc.:

• bana küstü = she got upset with me
• sana küstü = she got upset with you

This is just the normal pattern of the verb, so it is best to learn it as:

• birine küsmek = to be offended with someone / to get upset with someone

Kız kardeşim breaks down like this:

• kız kardeş = sister
• -im = my

So:

• kız kardeşim = my sister

Turkish often adds possession directly to the noun instead of using a separate word like my.

Compare:

• erkek kardeşim = my brother
• annem = my mother
• arkadaşım = my friend

Because Turkish often leaves subject pronouns out when they are already clear from context or from the verb ending.

In this sentence:

• küstü = he/she/it got upset
• başladık = we started

So the verb endings already tell you a lot:

• -dü here gives past tense, and third person singular often has no extra person ending
• -dık / -dik / -duk / -dük with -k shows we

That is why Turkish does not need to say o for she or biz for we unless the speaker wants emphasis.

Because the subject changes after ama.

First clause:

• Dün kız kardeşim bana küstü = Yesterday my sister got upset with me

Second clause:

• ama akşam yeniden konuşmaya başladık = but in the evening we started talking again

So the first action belongs to my sister, but the second action is something done by both of us. Turkish does not need to spell out biz because başladık already means we started.

Because konuşmaya başladık means we started talking, not simply we talked.

Here is the difference:

• konuştuk = we talked
• konuşmaya başladık = we started to talk / we began talking

Turkish commonly uses this pattern:

• verb stem + -ma/-me + dative + başlamak

So:

• konuşma = talking
• konuşmaya = to talking / into talking
• konuşmaya başlamak = to start talking

It is a very common structure:

• çalışmaya başladım = I started studying/working
• gülmeye başladı = she started laughing

It comes from the infinitive-like verb noun plus the dative ending.

Step by step:

• konuşmak = to speak / to talk
• remove -k and form the verbal noun: konuşma
• add the dative ending -ya
• result: konuşmaya

With başlamak, Turkish normally uses this form:

• bir şey yapmaya başlamak = to start doing something

So konuşmaya başladık literally has the structure we started to talking, but in natural English it means we started talking.

Yeniden means again or anew.

In this sentence:

• yeniden konuşmaya başladık = we started talking again

It is often very close in meaning to tekrar. In many everyday sentences, they can be interchangeable:

• yeniden dene = try again
• tekrar dene = try again

Sometimes yeniden can sound a little more like anew / once more, while tekrar is the more common everyday word for again / repeat, but the difference is usually small.

Because Turkish often uses time words directly as adverbs, without extra case endings.

So:

• dün = yesterday
• akşam = in the evening / evening

In this sentence:

• Dün sets the time for the first event
• akşam gives the time for the second event

This is very normal in Turkish:

• Bugün geliyorum. = I am coming today.
• Sabah kalktım. = I got up in the morning.
• Akşam dönerim. = I return in the evening.

You do not always need something like in the as English does.

Turkish word order is flexible, although some orders sound more natural than others.

This sentence:

• Dün kız kardeşim bana küstü, ama akşam yeniden konuşmaya başladık.

is very natural because it starts with time information and then gives the main idea.

But Turkish could rearrange parts for emphasis, for example:

• Kız kardeşim dün bana küstü...
• Akşam ama yeniden konuşmaya başladık would sound less natural, though, because ama usually connects clauses in a more standard position.

A useful idea is that Turkish often puts the most important or most focused information near the end of a clause, but adverbs like dün and akşam commonly appear early.

Not necessarily. Küsmek can describe anything from mild hurt feelings to a more serious falling-out.

It often suggests:

• emotional hurt
• taking offense
• sulking
• not wanting to talk for a while

So in family or friendship contexts, küsmek can be quite common and does not always mean a dramatic conflict. In this sentence, the fact that we started talking again in the evening suggests it may have been temporary.

A useful pattern to remember is:

• birine küs olmak = to be upset with someone
• birine küsmek = to become upset with someone / to take offense at someone