The adverb 即
Have a look at the two meanings of the adverb 即: "immediately" and "then".
"Immediately"
The adverb 即 
indicates that one action will happen immediately after another action.
indicates that one action will happen immediately after another action.Scheme
noun
verb 1
即
verb 2
Pay attention
The first action can be expressed by either a verb or a verb phrase.
Examples
你再查一下你的作业吧，有错即改
Check your homework once again. If there are any mistakes, correct them immediately
nǐ zài chá yíxià nǐ de zuòyè ba, yǒu cuò jí gǎi
我们决定，天亮即走
We decided to leave as soon as it was light outside
wǒmen juédìng, tiān liàng jí zǒu
"Then"
即 is used to indicate that an action will take place at a time that was specified earlier.
即 is placed before a verb.
is used to indicate that an action will take place at a time that was specified earlier.
即 is placed before a verb. Pay attention
In sentences with 即, “then” is often not stated in English.
Examples
此项工程明年即能完成
This construction may be completed next year
cǐ xiàng gōngchéng míngnián jí néng wánchéng
计算机联网连接，即彼此可互传信息
When computers are in a network, they are connected to each other so that information can be transmitted between them
jìsuànjī liánwǎng liánjiē, jí bǐcǐ kě hù chuán xìnxī
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