Arkadaşım ve ben hafta sonu müzeyi gezeceğiz.

Because arkadaş means friend, and the ending -ım is the 1st person singular possessive suffix, meaning my.

So:

• arkadaş = friend
• arkadaşım = my friend

Turkish usually expresses possession with a suffix on the noun, instead of a separate word like my.

Examples:

• ev = house
• evim = my house
• kitap = book
• kitabım = my book

Because the speaker wants to say exactly who the we is: my friend and I.

Using biz would only mean we, without naming the people. Turkish often leaves out pronouns when the subject is already clear, so once you say Arkadaşım ve ben, there is no need to add biz.

Yes, that is also grammatical.

Both of these work:

• Arkadaşım ve ben
• Ben ve arkadaşım

But putting the other person first often sounds a bit more natural or polite, similar to English my friend and I rather than I and my friend.

Because Arkadaşım ve ben means my friend and I, which is logically we.

In Turkish, when the subject includes ben plus another person, the verb goes in the 1st person plural form.

Compare:

• gezeceğim = I will visit/tour
• gezeceğiz = we will visit/tour

So even though the word ben appears, the whole subject is plural.

It can be broken down like this:

• gez- = verb stem
• -ecek = future tense
• -iz = we

So the basic structure is:

gez + ecek + iz = we will tour / we will visit

The written form becomes gezeceğiz because the k in -ecek softens to ğ before a vowel.

This kind of change is very common in Turkish:

• gelecek + iz → geleceğiz
• edecek + iz → edeceğiz
• gezecek + iz → gezeceğiz

Gezmek is broader than a simple go. It often means:

• to go around
• to look around
• to tour
• to visit/explore

So müzeyi gezeceğiz is not just we will go to the museum. It means more like:

• we will tour the museum
• we will look around the museum
• we will visit the museum

With places like museums, cities, or neighborhoods, gezmek often implies walking around and seeing the place.

Because müzeyi has the definite accusative ending.

In Turkish, a direct object usually takes an accusative ending when it is specific or definite.

So:

• bir müze gezeceğiz = we will visit a museum
• müzeyi gezeceğiz = we will visit the / that specific museum

The accusative ending here is -i, but since müze ends in a vowel, Turkish adds a buffer y:

• müze + i → müzeyi

That y is just there to make pronunciation smoother.

Because it is functioning as a time expression, and Turkish often uses time words with no extra case ending.

Here hafta sonu means something like:

• this weekend
• on the weekend
• at the weekend

This is similar to other simple time expressions:

• bugün = today
• yarın = tomorrow
• akşam = in the evening / tonight
• hafta sonu = on the weekend

So no extra ending is needed here.

Hafta sonu is the common simple expression for on the weekend / this weekend.

Hafta sonunda literally means at the end of the week, and depending on context it can overlap with at the weekend, but it feels more like a full case-marked phrase.

So in this sentence:

• hafta sonu müzeyi gezeceğiz = we’ll visit the museum this weekend

That is the most natural simple choice.

This is a very normal Turkish sentence pattern:

• Arkadaşım ve ben = subject
• hafta sonu = time
• müzeyi = object
• gezeceğiz = verb

A common neutral Turkish order is:

Subject + Time + Object + Verb

Turkish usually puts the verb at the end, which is one of the most important word-order differences from English.

Other orders are possible, but this version sounds natural and unmarked.

A rough guide is:

geh-zeh-jeh-eez

A few useful pronunciation points:

• g is always hard, like g in get
• z sounds like English z
• c in Turkish sounds like English j in jam
• ğ usually does not sound like a strong consonant; it often lengthens or smooths the vowel before it

So gezeceğiz does not sound like it has a strong separate g in the -ği- part.