他大概三十岁。
tā dàgài sānshí suì.
He is about thirty years old.
大概十分钟。
dàgài shí fēnzhōng.
About ten minutes.
他大概会来。
tā dàgài huì lái.
He will probably come.
我大概知道。
wǒ dàgài zhīdào.
I probably know / I have a rough idea.
