The adverbs with the meaning "quickly"
赶紧, 尽快, 赶快 and 赶忙 indicate speed
The adverbs 赶紧 
, 尽快 , 赶快 and 赶忙 emphasize the speed of an action.
They are placed after the subject and before the predicate.
, 尽快 , 赶快 and 赶忙 emphasize the speed of an action.
They are placed after the subject and before the predicate.The adverb 赶紧
赶紧 is more urgent and emphasizes that the action should be done without delay.
is more urgent and emphasizes that the action should be done without delay. Pay attention
赶紧 is most often used in spoken language.
Examples
他们赶紧送那个人进医院了
They immediately took the man to the hospital
tāmen gǎnjǐn sòng nà ge rén jìn yīyuàn le
我要赶紧走了
I have to go now
wǒ yào gǎnjǐn zǒu le
The adverb 赶快
赶快 emphasizes the need to speed up an action. 赶快 is used to express the actual situation or one's personal attitude.
emphasizes the need to speed up an action. 赶快 is used to express the actual situation or one's personal attitude. Pay attention
赶快 is used both in spoken and written language.
Examples
让他赶快吃玩吧，我们要出发了
Let him finish his meal quickly, we have to go
ràng tā gǎnkuài chīwán ba, wǒmen yào chūfā le
快要刮大风了，我们赶快回家吧
The wind is getting stronger, so let's get home quickly
kuài yào guā dà fēng le, wǒmen gǎnkuài huí jiā ba
The adverb 尽快
尽快 indicates that the action should be done as soon as possible. 尽快 is used only to express a personal opinion.
indicates that the action should be done as soon as possible. 尽快 is used only to express a personal opinion. Pay attention
尽快 is most often used in writing.
Examples
希望你能尽快给他回个电话
I hope you can call him back as soon as possible
xīwàng nǐ néng jǐnkuài gěi tā huí ge diànhuà
我希望这件事尽快做好
I hope this is done soon
wǒ xīwàng zhè jiàn shì jǐnkuài zuòhǎo
Pay attention
赶快 can be used in the imperative, whereas 尽快 cannot.
For example:
赶快把作业做完
尽快把作业做完 cannot be used in the above sentence.
尽快把作业做完 cannot be used in the above sentence.The adverb 赶忙
赶忙 indicates that the action is done hastily or in a hurry.
indicates that the action is done hastily or in a hurry. Pay attention
赶忙 also cannot be used in imperative sentences, and can only be used in declarative sentences.
Examples
要迟到了，他赶忙出门，早饭都没吃
He was late, so he rushed out without having breakfast
yào chídào le, tā gǎnmáng chūmén, zǎofàn dōu méi chī
他知道自己错了，赶忙向客人道歉
He knew he was wrong so he hurriedly apologised to his guests
tā zhīdao zìjǐ cuò le, gǎnmáng xiàng kèrén dàoqiàn