開く
あく
to open, to become open
Aku (開く) is a godan verb meaning "to open, to become open". Its polite form is 開きます (akimasu), its te form is 開いて (aite), its past form is 開いた (aita), and its negative form is 開かない (akanai).
Godan verbJLPT N5
Aku (開く) conjugation quick reference
開く means "to open, to become open". Its main forms are listed below, with links to the grammar pattern behind each form.
Aku example sentences
ドアがあく。
The door opens.
まどがあかなかった。
The window didn’t open.
今日は店があいていません。
The shop is not open today.
How to use Aku: grammar notes
•Use 開く with を when you are the one opening something, like ドアを開く (to open the door).
•Use が with 開く when something opens by itself or naturally, like ドアが開く (the door opens).
•Don’t confuse 開く (あく) with 開ける (あける); 開く is often used when something opens on its own, while 開ける is for when someone opens it.
•JLPT N5 level
Common phrases with Aku
ドアが開く
The door opens
店が開く
The store opens
心が開く
To open one’s heart (to someone)
Aku (開く) conjugation table
| Form | Japanese | Romaji |
|---|---|---|
| Basic Forms | ||
| Dictionary Form | 開く | aku |
| Masu Form | 開きます | akimasu |
| Te Form | 開いて | aite |
| Past Form | 開いた | aita |
| Negative Form | 開かない | akanai |
| Past Negative | 開かなかった | akanakatta |
| Polite Forms | ||
| Polite Present | 開きます | akimasu |
| Polite Past | 開きました | akimashita |
| Polite Negative | 開きません | akimasen |
| Polite Past Negative | 開きませんでした | akimasendeshita |
| Advanced Forms | ||
| Potential Form | 開ける | akeru |
| Passive Form | 開かれる | akareru |
| Causative Form | 開かせる | akaseru |
| Causative Passive | 開かされる | akasareru |
| Volitional Form | 開こう | akou |
| Imperative Form | 開け | ake |
| Conditional Forms | ||
| Conditional (ば) | 開けば | akeba |
| Conditional (たら) | 開いたら | aitara |
| Other Forms | ||
| Progressive Form | 開いている | aiteiru |
| Desire (たい) | 開きたい | akitai |
| Prohibition | 開くな | akuna |