買い物
買い物 means shopping here, as part of the exact expression 買い物リスト. It commonly appears before the thing connected with the shopping, such as リスト in this dialogue.
リスト
リスト means list here, specifically the shopping list in 買い物リスト. It is a loanword that can follow the type of list being discussed.
どおり
どおり means according to or following something, here in リストどおりに, meaning according to the list. A noun can come before どおりに to show the standard or instructions being followed.
に
In リストどおりにしましょう, に marks the manner or standard for the action: doing things according to the list. It connects どおり to the action proposed by しましょう.
しましょう
しましょう proposes doing the action together in a polite way; here, it means let us follow the list. It is useful when suggesting a shared action to another person.
そうすれば
そうすれば means if we do that or if things are done that way in this dialogue. In そうすれば, そう points back to following the list, and すれば presents that action as the condition for the result that follows. This construction links a previous action with its expected result.
買いすぎず
買いすぎず means without buying too much here. The form 買いすぎず comes before すみます to show that buying too much is avoided. It is useful when connecting an action that does not happen with the result of avoiding a problem.
すみます
In 買いすぎずにすみます, すみます means that the unwanted situation can be avoided, so buying too much will not be necessary or will not happen. The reusable pattern ずにすむ expresses being able to avoid an action or problem.
パスタ
パスタ means pasta here, one of the grocery items being located and chosen. It appears as one item in the noun pair パスタと米.
と
と connects the two grocery items in パスタと米, meaning pasta and rice. A common reuse pattern is noun と noun when listing two things together.
米
米 means rice here, the second grocery item being located. It is used together with パスタ in the exact phrase パスタと米.
は
In パスタと米はどこですか, は marks パスタと米 as the topic of the question. A topic marked by は is followed by the information being asked about or given.
どこ
どこ means where here, asking for the location of パスタと米. The pattern Xはどこですか is useful when politely asking where something is.
です
In どこですか, です gives the question a polite sentence ending. It is used here after どこ to make the location question polite.
乾物
乾物 names the dry-food category in 乾物売り場, where the pasta and rice are located. It commonly appears before 売り場 when identifying a shop section by the type of food sold there.
売り場
売り場 means a sales area or shop section here, specifically the section in 乾物売り場. It can follow a product category to identify where that category is sold.
あります
あります means are located or are there here, referring to the pasta and rice in the dry-food section. The location pattern にあります is useful for stating where an inanimate thing is.
これ
これ means this and points to the pasta being discussed in これは前回買ったパスタです. It is useful when identifying an item that is close to or currently under discussion.
前回
前回 means last time or the previous occasion here. In 前回買ったパスタ, it indicates when the pasta was bought and comes before the action connected to the noun.
買った
買った means bought here and describes the pasta bought on the previous occasion. It is the past form of 買う, and the pattern 前回買ったパスタ places this description before パスタ.
カート
カート means cart here, the shopping cart receiving the pasta pack. In カートに1パック入れましょう, に marks the cart as the destination of the item.
パック
パック means pack here, referring to one packaged unit of pasta in 1パック. The pattern number plus パック identifies how many packs are being placed in the cart.
入れましょう
入れましょう means let us put it in here, referring to putting one pack into the cart. It politely proposes a shared action, and the object and destination appear together in カートに1パック入れましょう.
その
その means that in the time expression そのあと, referring to the preceding shopping step. It is useful for pointing back to an already mentioned action or event.
あと
In そのあと, あと means afterward or after that, marking the time following the preceding step. The expression そのあと is useful for moving to the next action in a sequence.
必要
必要 means needed or necessary here, introducing what remains needed in 必要なのは牛乳だけです. It can describe an item or action that is required in the situation.
な
In 必要なのは牛乳だけです, な links 必要 to の so that the description can be treated as the thing being identified. It appears inside this construction before the nominalizing の.
の
In 必要なのは牛乳だけです, の turns the preceding phrase into a noun-like expression, allowing it to be marked by は. This pattern helps identify what is necessary or being discussed.
牛乳
牛乳 means milk here, the only item still needed after the other groceries are added. It is the item identified in 必要なのは牛乳だけです.
だけ
だけ means only here and limits the remaining need to 牛乳だけ. The pattern noun plus だけ is useful for saying that nothing else is included.
それから
それから means then or after that, moving the conversation to the next step. In それから, それ refers to the preceding point or action, and から contributes the sense of starting from that point in time. This expression is useful for linking actions in sequence.
まっすぐ
まっすぐ means straight here, describing a direct movement toward checkout. It appears before the destination and movement expression in まっすぐレジに向かえます.
レジ
レジ means checkout or cash register here, the place the shoppers will go to pay. In レジに向かえます, に marks it as the destination.
向かえます
向かえます means can head toward here, so the shoppers can go straight to checkout. A destination can be marked with に before this movement expression, as in レジに向かえます.