深い
ふかい
deep, profound
i-adjective
Conjugation Table
Present
深い
Negative
深くない
Past
深かった
Past Negative
深くなかった
Te Form
深くて
Adverbial
深く
Conditional
深ければ
Presumptive
深いでしょう
Example Sentences
その森はとても深いです。
That forest is very deep.
Sono mori wa totemo fukai desu.
昨日、深い湖で泳ぎました。
I swam in a deep lake yesterday.
Kinō, fukai mizuumi de oyogimashita.
彼の考えは深くない。
His thoughts are not deep.
Kare no kangae wa fukakunai.
Grammar Notes & Usage Tips
•Basic Usage**: As an i-adjective, 深い (ふかい) directly modifies nouns without needing a particle, as in 深い海 (ふかいうみ) for "deep sea." Just be sure to place it right before the noun!
•Conjugation Tip**: To say something "isn't deep," change 深い to its negative form: 深くない (ふかくない). For example, この川は深くない (このかわはふかくない) means "This river isn't deep."
•Past Tense**: If you want to talk about something that was deep, use the past tense form 深かった (ふかかった), like in 昨日の話は深かった (きのうのはなしはふかかった) for "Yesterday's story was profound."
•Adverbial Form**: When you want to use 深い as an adverb, like "deeply," change it to 深く (ふかく). For example, 深く考える (ふかくかんがえる) means "to think deeply."
•い-adjective: Conjugates by changing the い ending