Express “Need”

1. Needing a Noun (Object)

To say you need a thing, you use the adjective iru (要る).

• Grammar: [Noun] + が + 要る (iru)

• Polite form: [Noun] + が + 要ります (irimasu)

Example: > * ビザが要ります。 (Biza ga irimasu) — I need a visa.

• お金が要る。 (Okane ga iru) — I need money.

Note: Be careful not to confuse this with the verb iru (いる) used for the existence of living things. They sound the same but use different kanji!

2. Needing to do an Action (Verb)

There are two main ways to express this. One is "necessary," and the other is the more common "must do."

A. The "Necessary" Way (Hitsuyo)

This is a direct translation of "it is necessary to..." It feels a bit more formal or objective.

• Grammar: [Dictionary Verb] + 必要があります (hitsuyo ga arimasu)

Example: > * 練習する必要があります。 (Renshuu suru hitsuyo ga arimasu) — It is necessary to practice.

B. The "Must/Have to" Way (Nakereba naranai)

In daily life, Japanese speakers usually express "need to do" by saying "if I don't do it, it won't do." It’s the standard way to say "I have to."

• Grammar: [Verb Neg-stem] + なければなりません (nakereba narimasen)

Example: > * 行かなければなりません。 (Ikanakereba narimasen) — I need to go / I must go.

Pro-Tip: Casual Slang

In casual conversation, the "must do" form is almost always shortened. Instead of the long nakereba narimasen, you'll hear:

• 〜なきゃ (nakya) — e.g., Ikanakya! (I gotta go!)

• 〜なくちゃ (nakucha) — e.g., Tabenakucha! (I gotta eat!)

Form A: ~nakya (The most common)

This is a contraction of nakereba (the "if not" part). The "must" part is implied and dropped entirely.

• Formal: 行かなければなりません (Ikanakereba narimasen)

• Casual: 行かなければ (Ikanakereba)

• Slang: 行かなきゃ (Ikanakya) — "Gotta go."

Form B: ~nakucha

This is a contraction of nakute wa (another way of saying "if not"). It sounds slightly more "urgent" or even "cute/childlike" depending on the speaker, but it’s very common for everyone.

• Formal: 行かなくてはいけません (Ikanakute wa ikemasen)

• Slang: 行かなくちゃ (Ikanakucha) — "Gotta go."