書類
「書類」 means the form or document that is being completed in 書類を書き終わりました. A common reuse pattern is 書類を書く, meaning to fill out or write a document.
を
「を」 marks 書類 as the object of the action in 書類を書き終わりました. It commonly comes after the thing someone writes, reads, or uses.
書き終わり
In 書類を書き終わりました, 「書き終わり」 expresses finishing writing the form. 「書き」 contributes writing, and 「終わり」 contributes completion; together they describe completing the writing. A reusable pattern is Xを書き終わる, meaning to finish writing X.
ました
「ました」 makes 書き終わりました a polite statement about a completed action. It is used at the end of a polite sentence when reporting that something has been completed.
私たち
「私たち」 means we or us in 私たちは次のウォーキングイベントに参加できますか. It refers to the speaker together with at least one other person and commonly comes before は when that group is the topic.
は
「は」 marks 私たち as the topic in 私たちは次のウォーキングイベントに参加できますか. It commonly follows the person or thing being discussed.
次
「次」 means next in 次のウォーキングイベント, identifying the upcoming walking event. It commonly comes before の when it describes a following noun.
の
「の」 links 次 to ウォーキングイベント in 次のウォーキングイベント, showing that the event is the next one. A common pattern is descriptive noun + の + noun.
ウォーキング
「ウォーキング」 means walking in ウォーキングイベント. Here it describes the type of event and is followed directly by イベント.
イベント
「イベント」 means event in ウォーキングイベント. It is a noun that can be combined with another noun, as in ウォーキングイベント.
に
In ウォーキングイベントに参加できますか, 「に」 marks the event as the one being joined. The reusable pattern is Xに参加する or Xに参加できます, meaning to join or be able to join X.
参加
「参加」 means joining or participation in ウォーキングイベントに参加できますか. With できます, it expresses being able to participate, and a common pattern is Xに参加する.
できます
「できます」 expresses that joining the event is possible in 参加できます. It commonly follows an activity or action and can be used in a question with か to ask whether it is possible.
か
「か」 marks 私たちは次のウォーキングイベントに参加できますか as a question. It is placed at the end of this polite question.
はい
「はい」 means yes in はい、次のウォーキングイベントに参加できます. It confirms the preceding question or statement and commonly appears at the beginning of an answer.
何か
「何か」 means anything or something in 何か持ってきたほうがいいですか. In this question, it asks whether there is anything that should be brought, and it commonly comes before an action.
持ってきた
In 持ってきたほうがいいですか, 「持ってきた」 refers to bringing something to the current place. 「持って」 contributes carrying or holding, and 「きた」 contributes movement toward here; together they form the bringing action used in the advice question. A reusable pattern is Xを持ってくる, meaning to bring X.
ほう
「ほう」 refers to an option or course of action in 持ってきたほうがいいですか. With Xがいい, it presents X as the preferable choice, as in Xしたほうがいい.
が
In 持ってきたほうがいいですか, 「が」 marks the option being considered preferable. The pattern Xほうがいい is used to say that doing X is better or advisable.
いい
「いい」 means good or preferable in 持ってきたほうがいいですか. In the pattern Xほうがいい, it evaluates that option as better or advisable.
です
「です」 makes いいですか polite in the question 持ってきたほうがいいですか. It appears before か when forming this polite question.
水筒
「水筒」 means a water bottle in 水筒を持ってきてください. It is the object being requested and commonly comes before を when someone is asked to bring it.
持ってきて
In 水筒を持ってきてください, 「持ってきて」 means bring the water bottle here. 「持って」 contributes carrying, and 「きて」 contributes coming toward the current place; together they make the request to bring it. A reusable pattern is Xを持ってきてください, meaning please bring X.
ください
「ください」 makes 水筒を持ってきてください a polite request to bring a water bottle. It commonly follows a て-form action when asking someone to do something.
大きな
「大きな」 means large in 大きなバッグ. It directly describes バッグ and is used before the noun it modifies.
バッグ
「バッグ」 means bag in 大きなバッグは受付に置いておけます. Here it is the item that can be left at the reception desk and is marked as the topic with は.
受付
「受付」 means the reception or registration desk in 受付に置いておけます. It is the place where the bag can be left, so it is followed by に.
置いておけます
In 受付に置いておけます, 「置いておけます」 means can leave or keep something there. 「置いて」 contributes placing the bag, and 「おけます」 contributes the possibility of leaving it in that state. A reusable pattern is Xを場所に置いておけます, meaning you can leave X at a place.
私
「私」 means I or me in 私は小さい水筒を持っています. It identifies the speaker and is followed by は when the speaker is the topic.
小さい
「小さい」 means small in 小さい水筒. It describes the size of the water bottle and comes directly before the noun.
持っています
「持っています」 means have or be carrying in 小さい水筒を持っています. 「持って」 contributes holding or carrying, and 「います」 presents that state as continuing; together they say that the speaker has the bottle with them. A common pattern is Xを持っています, meaning I have or am carrying X.
始める
「始める」 means start in 始める前に. Here it refers to starting the walking event or activity, and it commonly comes before 前に to express before starting.
前
「前」 means before in 始める前に. In the pattern X前に, it places the following action before X happens.
ここ
「ここ」 means here in ここに置いておきます. It identifies the place where the bag will be left and commonly combines with に when marking a destination or location for an action.
置いておきます
In ここに置いておきます, 「置いておきます」 means will put or leave something there for later. 「置いて」 contributes placing the bag, and 「おきます」 contributes doing this in advance or leaving it in place. A reusable pattern is Xを場所に置いておきます, meaning I will leave X at a place.
楽しみにしています
「楽しみにしています」 means I am looking forward to it in the final line. 「楽しみ」 names the anticipation, 「に」 sets that anticipation as the state being maintained, 「して」 forms that state, and 「います」 shows it continues. This expression is commonly used when someone expects an upcoming event with pleasure.