私がいるよ

わたし

I, me

My friend is very kind.

The most common first-person pronoun in modern Japanese, used by both men and women. More formal than 俺 (ore) or 僕 (boku). The reading わたくし is more formal than わたし.

subject marker particle; but

It's a night when the stars are beautifully visible.

Marks the grammatical subject, especially for new information or in subordinate clauses. Emphasizes what performs the action. Also means 'but' when connecting clauses.

to be, to exist (for animate objects)

The teacher is in the room.

Used to indicate the existence or presence of animate objects (people, animals). Also used as an auxiliary verb with て-form to show ongoing actions.

emphatic particle (I tell you, you know)

That medicine is bitter, you know!

よ adds emphasis or assertion to statements, often conveying new information to the listener or drawing attention. It can express warning, reminder, or gentle insistence. More assertive than ね.

おおきな

big; large; great

There is a big tree in the park.

A pre-noun adjectival form meaning large in size, volume, or degree. It is only used before nouns.

こえ

voice, sound

I can hear voices from the next room.

Primarily refers to human or animal voices, but can also mean sounds made by objects or nature. Often used with 聞こえる (to be heard) or 出す (to produce).

by, at, in, with (particle)

I commute by train.

Marks location of action (where something happens), means/tool (how/with what), material, reason, or scope. Different from に which marks location of existence.

わらう

to laugh; to smile; to sneer

He heard the joke and laughed out loud.

Mainly means to express joy or amusement, but can also mean 'to sneer' (嗤う) or 'to bloom' (咲う).