貯金を始めることにしました。
- I’ve decided to start saving money.

貯金を始めることにしました。 meaning: I decided to start saving money.

The sentence follows a subject-object-verb structure, though the subject is often omitted in Japanese when it's understood from context. The core structure is: subject (implied) + 貯金(savings) + を(object marker) + 始める(to begin) + ことにしました(decided to do). ⚫︎ The sentence is a complete thought, expressing the speaker's decision. ⚫︎ The word order can feel different from English, but it's logical within the Japanese grammatical framework. ⚫︎ Focus on identifying the main verb and the relationship between the different elements.

The verb 始める (hajimeru) means "to begin" or "to start." It's a transitive verb, meaning it typically takes a direct object, marked by the particle を (o). ⚫︎ **Verb Form:** 始める is a godan verb (group 1 verb). ⚫︎ **Conjugation:** * Dictionary form: 始める (hajimeru) * Stem form (masu-stem): 始め (hajime) - used for polite form (始めます) and other grammatical constructions. * Past Tense: 始めた (hajimeta) * Negative Present: 始めない (hajimenai) * Negative Past: 始めなかった (hajimenakatta) ⚫︎ **Usage in the Sentence:** In the sentence, 始める is in the dictionary form, preparing it for the next grammar point, the expression ことにする. ⚫︎ **Example:** 勉強を始めました。(Benkyō o hajimemashita.) - I started studying.

ことにする (koto ni suru) is a common fixed expression meaning "to decide to do something" or "to make a decision to do something." It expresses a conscious choice or resolution. ⚫︎ **Structure:** Verb (plain form) + ことにする * The plain form is either the dictionary form of a verb. ⚫︎ **Usage in the sentence:** * 始める (hajimeru - dictionary form) + ことにする --> 始めることにする (hajimeru koto ni suru - to decide to start) * しました (shimashita) - past tense of する (to do/to make), which makes the whole sentence a past tense sentence "I decided to..." ⚫︎ **Variations:** * Present: ことにします (koto ni shimasu) - "I decide to..." or "I will decide to..." (polite form) * Past: ことにしました (koto ni shimashita) - "I decided to..." (polite form, as used in the example sentence) * Negative: ことにしない (koto ni shinai) - "I decide not to..." (plain form) / ことにしません (koto ni shimasen) - "I decide not to..." (polite form) * Negative Past: ことにしなかった (koto ni shinakatta) - "I decided not to..." (plain form) / ことにしませんでした (koto ni shimasen deshita) - "I decided not to..." (polite form) ⚫︎ **Example:** 毎日、日本語を勉強することにしました。 (Mainichi, nihongo o benkyō suru koto ni shimashita.) - I decided to study Japanese every day.

Particles are crucial in Japanese grammar, marking the grammatical function of words in a sentence. ⚫︎ **を(o):** Marks the direct object of a transitive verb. * In the example sentence, 貯金 (chokin - savings) is the object of the verb 始める (hajimeru - to start). * 貯金 + を --> 貯金を (chokin o - savings - object marker) ⚫︎ **に(ni):** Can mark various things, including the purpose of an action, or a place. In this case there is no に in the example sentence. ⚫︎ **Example:** 本を読みます。 (Hon o yomimasu.) - I read a book. (本 (hon - book) is the direct object.)

The word 貯金(chokin) means "savings." It is a noun. ⚫︎ **Noun Characteristics:** Japanese nouns do not have grammatical genders or plural forms. The context usually clarifies whether the speaker is referring to one instance of something or multiple instances. ⚫︎ **Usage:** In this sentence, 貯金 is the object of the verb, showing what action is being performed, marked with the particle を. ⚫︎ **Example:** 私は貯金が大好きです。(Watashi wa chokin ga daisuki desu.) - I love saving money.

しました(shimashita) is the past tense polite form of the verb する(suru - to do/to make). ⚫︎ **Verb form:** する (suru) is an irregular verb (group 3 verb). ⚫︎ **Conjugation:** * Dictionary form: する (suru) * Stem form (masu-stem): し (shi) * Past Tense Plain Form: した (shita) * Present Polite Form: します (shimasu) * Past Polite Form: しました (shimashita) ⚫︎ **Politeness:** The ました(mashita) ending makes the sentence polite. It's used in formal or everyday situations when speaking to someone you want to show respect to. ⚫︎ **Example:** 宿題をしました。(Shukudai o shimashita.) - I did my homework. (past tense) * 宿題をします。(Shukudai o shimasu.) - I will do my homework. (present tense) * 宿題をした。(Shukudai o shita.) - I did my homework. (plain, past tense) * 宿題をする。(Shukudai o suru.) - I do my homework. (plain, present tense)