Phrases with the structure 无A无B
Phrases with the structure 无A无B 
are set expressions that need to be memorized.
In the construction, we replace "A" and "B" with monosyllabic words that have similar meanings.
Here are some examples of these set expressions:
are set expressions that need to be memorized.
In the construction, we replace "A" and "B" with monosyllabic words that have similar meanings.
Here are some examples of these set expressions:无法无天
无时无刻
无忧无虑
无声无息
无始无终
无边无际
无大无小
无缘无故
无时无刻
无忧无虑
无声无息
无始无终
无边无际
无大无小
无缘无故 Pay attention
If a phrase with the structure 无A无B is placed before a verb, the particle 地 is usually placed between them.
If a phrase with the structure 无A无B is placed before a noun, the particle 的 is usually placed between them.
is usually placed between them.
If a phrase with the structure 无A无B is placed before a noun, the particle 的 is usually placed between them.Examples
他常常无缘无故地生我的气
He is often angry with me for no reason
tā chángcháng wú yuán wú gù de shēng wǒ de qì
我们无时无刻不在盼望你的到来
We are always looking forward to your arrival
wǒmen wú shí wú kè bú zài pànwàng nǐ de dàolái
我的梦想是旅行在这个无边无际的世界
My dream is to travel around this boundless world
wǒ de mèngxiǎng shì lǚxíng zài zhè ge wú biān wú jì de shìjiè