大概 as an adjective and an adverb
大概 can be used to make an assumption, an estimation or an inference.
大概 
can be both an adverb and an adjective.
The adverb 大概 has two meanings.
1) "probably".
can be both an adverb and an adjective.
The adverb 大概 has two meanings.
1) "probably".
Examples
我生病了，明天大概不会来上课
I'm sick, so I may not come to class tomorrow
wǒ shēngbìng le, míngtiān dàgài bú huì lái shàngkè
他大概在我们医院最有经验的医生
He is probably the most experienced doctor in our hospital
tā dàgài zài wǒmen yīyuàn zuì yǒu jīngyàn de yīshēng
Pay attention
An adverb is placed before the predicate. The predicate can also be preceded by a preposition, such as 在 , 把 or 被 . In this case, the adverb is placed before the preposition.
, 把 or 被 . In this case, the adverb is placed before the preposition.2) "approximately", "briefly".
Examples
我大概明白了要做什么
I have a general understanding of what to do
wǒ dàgài míngbái le yào zuò shénme
医院离这儿大概有五百米
It's about 500 metres from here to the hospital
yīyuàn lí zhèr dàgài yǒu wǔbǎi mǐ
The adjective 大概 means "approximate, general". It is usually followed by the particle 的 .
.
Examples
你可以给我解释大概的意思吗？
Can you explain the general meaning?
nǐ kěyǐ gěi wǒ jiěshì dàgài de yìsi ma
那家公司只给我们提供了大概的数字
That company only gave us approximate numbers
nà jiā gōngsī zhǐ gěi wǒmen tígōng le dàgài de shùzì