すみません
In this dialogue, すみません means “Excuse me” and politely gets the shop staff’s attention before a question. A learner can use it when addressing a shop worker or another person politely.
ジュース
ジュース refers to juice, the item whose location the customer asks about. In ジュースはどこですか?, it is the item being discussed.
は
In ジュースはどこですか?, は marks ジュース as the topic of the question. A reusable pattern is Xはどこですか? for asking where something is.
どこ
どこ means “where” in どこですか? and asks for a location. A reusable pattern is Xはどこですか? when asking where an item or place is.
です
In どこですか?, です gives the question a polite sentence ending. It is useful in polite questions about what or where something is.
か
At the end of どこですか?, か marks the sentence as a question. It is commonly placed at the end of a polite question.
この
この means “this” before a noun, and この売り場 means “this section” in the dialogue. A reusable pattern is この plus a noun when referring to something nearby.
売り場
売り場 means a sales area or section of a shop. In この売り場にあります, it identifies the section where the juice is located.
に
In この売り場にあります, に marks この売り場 as the location where the juice is found. A reusable pattern is placeにあります for saying that an inanimate thing is in a place.
あります
あります politely says that an inanimate thing is located or exists. Here, it says the juice is in この売り場; a reusable pattern is itemは placeにあります.
冷たい
冷たい means “cold” and describes the temperature of the drinks in 冷たい飲み物. A reusable pattern is 冷たい plus a noun when describing something cold.
飲み物
飲み物 means “drink” or “beverage.” In 冷たい飲み物, it refers to the cold drinks next to which the juice is placed.
の
In 冷たい飲み物の隣, の links 冷たい飲み物 to 隣 and gives the meaning “next to the cold drinks.” A reusable pattern is Aの隣 for “next to A.”
隣
隣 means “beside” or “next to.” In 冷たい飲み物の隣です, it identifies the juice’s location relative to the cold drinks.
何
何 means “what” in 何がおすすめですか? and asks which item is recommended. A reusable pattern is 何が...ですか? when asking what has a certain description or role.
が
In 何がおすすめですか?, が marks 何 as the thing being identified as recommended. The pattern 何が...ですか? asks which thing fits the description.
おすすめ
おすすめ means a recommendation or a recommended choice. In 何がおすすめですか?, the customer asks the staff which item they recommend.
さっぱりした
さっぱりした describes the juice as having a fresh or refreshing quality in さっぱりした味. It can be reused before 味 when describing a refreshing taste.
味
味 means “taste” or “flavor.” In さっぱりした味, it refers to the juice’s refreshing taste.
で
In さっぱりした味で、飲みやすいです, で links the refreshing taste with the additional description that the juice is easy to drink. It is useful for connecting descriptions of the same thing.
飲みやすい
飲みやすい means “easy to drink” and describes the juice as comfortable or simple to drink. A reusable pattern is a verb form plus やすい for something that is easy to do.
では
では means “then” or “in that case” in では、そのボトルを買います. It marks the customer’s decision after hearing the recommendation and can introduce a decision in polite conversation.
その
その means “that” before a noun, and そのボトル refers to the bottle being discussed or recommended. A reusable pattern is その plus a noun when both people know which item is meant.
ボトル
ボトル means “bottle.” In そのボトル, it refers to the bottle the customer has chosen to buy.
を
In そのボトルを買います, を marks そのボトル as the object of 買います. A reusable pattern is objectを plus a verb when stating what someone does or buys.
買います
買います is the polite form used here to state the decision to buy. A reusable pattern is itemを買います when politely saying that you will buy an item.