Yazdan önce kilo verecek.

The ending -dan is the ablative case suffix, which often means from or is used in expressions like before and after.

So:

• yaz = summer
• yazdan önce = before summer

With önce and sonra, Turkish usually uses the ablative:

• dersten önce = before the lesson
• işten sonra = after work

So yazdan önce is the normal way to say before summer.

In Turkish, önce means before, but it comes after the noun phrase it relates to.

So Turkish says:

• yazdan önce = literally summer-from before

English puts before first, but Turkish puts önce after the thing being referred to.

Compare:

• yemekten önce = before the meal
• okuldan önce = before school
• yazdan önce = before summer

This is just the normal Turkish pattern.

Turkish often leaves out the subject when it is clear from context.

Verecek means he/she/it will give or, in this phrase, he/she will lose. Turkish does not need to say o unless you want emphasis or clarity.

So:

• Yazdan önce kilo verecek. = He/She will lose weight before summer.
• O yazdan önce kilo verecek. = He/She will lose weight before summer.
  (with extra emphasis on he/she)

This is very common in Turkish.

Verecek comes from the verb vermek = to give.

Breakdown:

• verb stem: ver-
• future tense suffix: -ecek

So:

• ver- + -ecek = verecek

It means will give.

In this sentence, because Turkish uses the expression kilo vermek, verecek means will lose as part of will lose weight.

Yes, vermek normally means to give. But kilo vermek is a fixed Turkish expression meaning to lose weight.

Literally, it looks like:

• kilo = kilo / weight
• vermek = to give

But together, kilo vermek means to lose weight.

This is one of those expressions you learn as a whole phrase, just like English has phrases whose meaning is not completely literal.

Useful contrast:

• kilo vermek = to lose weight
• kilo almak = to gain weight

Because kilo vermek is an established idiomatic expression, and kilo is used here in a general sense: to lose weight.

Using kiloyu would sound like a specific direct object, as if you were talking about the weight in a more concrete or unusual way. In normal Turkish, the standard expression is simply:

• kilo vermek = lose weight

So the sentence uses the natural idiom.

It is in the future tense.

The ending -ecek / -acak is the Turkish future suffix.

Here:

• verecek = will lose / will give

So the whole sentence means that the action is expected to happen in the future, specifically before summer.

More examples:

• gelecek = will come
• gidecek = will go
• yapacak = will do

Turkish word order is flexible, but the verb usually comes at the end.

This sentence follows a very normal pattern:

• Yazdan önce = time expression
• kilo = object-like element inside the expression
• verecek = verb

So the structure is roughly:

Before summer + weight + will lose

That may feel backwards compared to English, but it is standard Turkish.

A very natural English-like translation is:

• He/She will lose weight before summer.

Not every Turkish sentence has to start with the subject.

Here it means summer.

Turkish yaz can also be connected to the verb yazmak = to write, but in this sentence yazdan is clearly a noun with the ablative ending -dan, so it means from summer / before summer, not anything related to writing.

So:

• yaz = summer
• yazdan önce = before summer

The grammar makes the meaning clear.

Yes. In English, both can work depending on context.

Turkish does not have articles like a or the, so yazdan önce can be understood as:

• before summer
• before the summer

In many contexts, before summer sounds most natural in English.

You might hear forms related to kaybetmek (to lose), but for body weight, kilo vermek is the standard and most natural expression.

So:

• kilo verecek = natural, idiomatic
• kilo kaybedecek = less natural for everyday speech in this meaning

Turkish usually prefers:

• kilo verdi = he/she lost weight
• kilo verecek = he/she will lose weight

Good pattern to learn.

Negative

Add the negative marker before the future ending:

• Yazdan önce kilo vermeyecek. = He/She will not lose weight before summer.

Question

Turkish usually uses the question particle mi separately:

• Yazdan önce kilo verecek mi? = Will he/she lose weight before summer?

Negative question

• Yazdan önce kilo vermeyecek mi? = Won’t he/she lose weight before summer?

These are useful variations of the same sentence pattern.