出かける
In this dialogue, 出かける means to leave home or go out. It appears in 出かける前に, meaning before leaving. A useful pattern is an action followed by 前に to say that something happens before that action.
前
Here, 前 means “before” in time, as part of 出かける前に. It places the checking action before leaving. The pattern action+前に is useful for describing what happens before an event.
に
In 出かける前に, に marks the time when the checking takes place: before leaving. This is a time-use of に, attached to a time expression. It is also used after other time expressions to mark when something happens.
全部
Here, 全部 means “everything” or “all of it,” referring to the things needed before leaving. In 全部そろっていますか?, it asks whether all the necessary things are ready. It commonly comes before a phrase describing whether everything is present or complete.
そろっています
In 全部そろっていますか?, そろっています means that everything is together and ready. The form describes the current state of the needed items, which is why it fits a check before leaving. It can be reused when checking whether required things are all present.
か
Here, か marks the sentence as a question in 全部そろっていますか?. It turns the statement about everything being ready into a request for confirmation. It is commonly placed at the end of a polite question.
今
In 今、確認しましょう。, 今 means “now,” the time when the speakers will check. It makes the suggested action immediate. It can be placed near the beginning of a sentence to state when an action happens.
確認しましょう
確認しましょう means “let’s check” or “let’s confirm” and invites both people to check something together. In this dialogue, the speakers use it to begin checking their belongings and the door. It is useful when proposing a shared checking action.
鍵
In this dialogue, 鍵 means “key,” as in 鍵を持っていますか? and 鍵は私のポケットに入っています。. It refers to the key needed before leaving. It can be used with を when asking whether someone has or carries the key, or with は when making it the topic.
を
In 鍵を持っていますか?, を marks 鍵 as the object of 持っています. It shows what the person has or is carrying. The pattern noun+を+action is commonly used to identify what an action concerns.
持っています
In 鍵を持っていますか?, 持っています means “have” or “be carrying” the keys. The question checks whether the keys are currently with the person. It is useful with を to ask whether someone has or carries a particular item.
は
In 鍵は私のポケットに入っています and 財布はあなたのバッグの中にありますか?, は marks the item being discussed as the topic. It tells the listener that the following information concerns the keys or wallet. It commonly follows a noun when giving information about that noun.
私
Here, 私 means “I” and, with の, gives the meaning “my” in 私のポケット. It identifies the speaker as the owner or associated person. The pattern 私の+noun is used to identify something belonging to or connected with the speaker.
の
In 私のポケット and あなたのバッグ, の connects a person with the noun that follows, showing a possessive or modifying relationship. Thus 私のポケット means “my pocket.” The reusable pattern is person+の+noun.
ポケット
ポケット means “pocket” in 私のポケットに入っています. It identifies the place where the keys are located. It can be used with に when stating that something is inside or located in a pocket.
入っています
In 鍵は私のポケットに入っています。, 入っています means that the keys are inside the pocket. It describes the keys’ current location rather than the action of putting them there. It is useful for saying that an item is inside a container or place.
財布
財布 means “wallet” in 財布はあなたのバッグの中にありますか?. The question checks whether the wallet is in the other person’s bag. It can be used as the topic of a question about where the wallet is.
あなた
Here, あなた means “you” in the possessive expression あなたのバッグ, so the phrase means “your bag.” It identifies the person associated with the bag. The pattern あなたの+noun is used to say “your” followed by an object.
バッグ
バッグ means “bag” in あなたのバッグの中. It identifies the container being checked for the wallet. It can be followed by の中 to refer to the inside of the bag.
中
In バッグの中に, 中 means “inside” or “the interior.” It identifies the inside of the bag as the wallet’s location. The pattern container+の中に is useful for saying that something is inside a container.
あります
In 財布はあなたのバッグの中にありますか?, あります asks whether the wallet is located in the bag. It is used here to state or ask about the location of an inanimate object. It commonly follows a place expression such as バッグの中に.
入れました
In 私は財布をバッグに入れました。, 入れました means “put in,” reporting that the speaker placed the wallet into the bag. The form describes a completed placement. A useful pattern is objectをcontainerに入れました.
ドア
ドア means “door” in ドアに鍵がかかっていますか? and ドアを確認しました. It is the door being checked before leaving. It can be followed by に when describing its locked state or marked by を as the object of checking.
が
In ドアに鍵がかかっていますか?, が marks 鍵 as the subject of the expression 鍵がかかっています. It does not itself mean “locked”; the locked meaning comes from the whole expression. It is commonly placed after the noun being described by the following phrase.
かかっています
In ドアに鍵がかかっていますか?, かかっています is part of 鍵がかかっています, meaning that the door has its lock engaged or is locked. The whole expression describes the door’s locked state. It can be reused in the phrase ドアに鍵がかかっています when checking a door.
たった
In たった今, たった narrows 今 to a very recent time, giving the meaning “just.” Together, たった今 means “just now,” as in the speaker’s immediate check. This expression is useful when reporting that something happened a moment ago.
確認しました
In 私はたった今、ドアを確認しました。, 確認しました means “checked” or “confirmed,” referring to the door. It reports that the speaker has just completed a check. A useful pattern is objectを確認しました, such as ドアを確認しました.