大概【dàgài】

大概 before a verb says something is probably true. The speaker leans towards yes, more firmly than with 也许.

吧 at the end often comes with it and asks the listener to agree.

It can also go in front of the subject. A negative always follows it.

• × 他不大概来 → 他大概不来

Before a number, 大概 means "about" – the use it shares with 差不多 and 左右.

大概 is also a noun-like word for "the rough outline": 大概的意思 is the gist, and 知道个大概 is knowing roughly what happened.