速い
はやい
fast, quick
i-adjective
Conjugation Table
Present
速い
Negative
速くない
Past
速かった
Past Negative
速くなかった
Te Form
速くて
Adverbial
速く
Conditional
速ければ
Presumptive
速いでしょう
Example Sentences
彼の車は速いです。
His car is fast.
Kare no kuruma wa hayai desu.
昨日は速く走りませんでした。
I didn't run fast yesterday.
Kinō wa hayaku hashirimasen deshita.
速く来てください。
Please come quickly.
Hayaku kite kudasai.
Grammar Notes & Usage Tips
•Conjugation Tip**: As an i-adjective, 速い (はやい) follows a straightforward conjugation pattern—just drop the い to form the negative (速くない), past (速かった), and past negative (速くなかった) forms, which keeps things simple!
•Particle Pairing**: When describing something as fast, use 速い with the particle が if it’s the subject of the sentence, like in "その車が速い" (That car is fast), to ensure clarity and correctness in your sentence structure.
•Avoiding Common Mistakes**: Don't confuse 速い (はやい) with 早い (also pronounced はやい), which means "early." Context is key, so pay attention to the situation—whether it’s speed or time you’re referring to.
•Usage Tip**: You can enhance your sentence by pairing 速い with adverbs like とても (very) or あまり (not very) to express different degrees of speed, such as "とても速い" (very fast) or "あまり速くない" (not very fast).
•い-adjective: Conjugates by changing the い ending