Khi đến nhà Lan, chúng tôi sẽ chụp ảnh cùng gia đình cô ấy.

Khi means when. It introduces a time clause: Khi đến nhà Lan = When we get to Lan’s house or When we arrive at Lan’s home.

Vietnamese often puts the time clause first, followed by the main clause.

The subject is understood from context. In this sentence, the implied subject of đến is the same as chúng tôi in the main clause.

So Vietnamese can say:

Khi đến nhà Lan, chúng tôi sẽ chụp ảnh...

even though natural English needs:

When we arrive at Lan’s house, we will take photos...

Dropping repeated subjects is very common in Vietnamese.

Đến often means arrive, reach, or get to. Depending on context, English may translate it as come to or go to, but here arrive at or get to is the best fit.

So đến nhà Lan is most naturally understood as arrive at Lan’s house or get to Lan’s place.

Also, Vietnamese does not need a separate preposition like to or at here. Đến can take the destination directly.

It can mean either, depending on context. In đến nhà Lan, nhà usually refers to Lan’s home / Lan’s place, not just the physical building.

So English could translate it as:

• Lan’s house
• Lan’s home
• Lan’s place

All are possible depending on tone.

Vietnamese often shows possession simply by putting the owner after the noun. So:

• nhà Lan = Lan’s house
• sách Minh = Minh’s book

You can also say nhà của Lan, but it is a bit heavier and often unnecessary when the meaning is already clear. Nhà Lan is shorter and very natural.

Sẽ is a future marker. It shows that the action has not happened yet:

• chúng tôi chụp ảnh = we take photos / we take a photo
• chúng tôi sẽ chụp ảnh = we will take photos

Vietnamese does not always have to mark the future if the time is already obvious from context, but sẽ makes it explicit.

Yes. Chụp ảnh is a very common expression meaning to take photos or to take a picture.

• chụp = to photograph / to shoot
• ảnh = photo / photograph

Together, chụp ảnh works as the normal verb phrase for taking pictures. You may also hear chụp hình, which means the same thing and is also very common.

Cùng means with or together with.

So chụp ảnh cùng gia đình cô ấy means take photos with her family. It suggests that we and her family are together in the photo situation.

In this sentence, cùng sounds very natural because English also commonly says take a photo with someone.

Yes, cô can mean several things depending on context, including a kinship term or a respectful form of address. But cô ấy can also function as she / her for a female person in standard written Vietnamese.

So here cô ấy simply refers back to Lan and means her.

That said, Vietnamese pronouns depend a lot on age, relationship, and situation. In real conversation, speakers might also repeat the name Lan or use another pronoun if that fits the relationship better.

All three are possible:

• gia đình cô ấy = her family
• gia đình của cô ấy = her family
• gia đình Lan = Lan’s family

The version in the sentence, gia đình cô ấy, is very natural because Lan has already been mentioned, so using her avoids repeating the name.

As with nhà Lan, Vietnamese often leaves out của when possession is already clear. So gia đình cô ấy is smoother and less heavy than gia đình của cô ấy in many contexts.