knowledge · n
to (the best of) my knowledge
B2 used to say that you think that something is true, but cannot be sure
Dictionary examples:
To the best of my knowledge, she's never worked abroad. (29.0)
common knowledge
B2 something that a lot of people know
Dictionary examples:
It's common knowledge that four of the teachers will not be returning next year. (38.1)
a working knowledge of sth
B2 knowledge about something which is good enough to be useful
Dictionary examples:
She has a working knowledge of German and Russian. (82.8)
knowledge
B1 information and understanding that you have in your mind
Dictionary examples:
Her knowledge of excuses was so vast, she never did her homework. (0.0)
His knowledge of cooking was so bad, he boiled water and burned it. (0.0)
His knowledge of directions was so bad, he got lost in his own house. (0.0)
He has a limited knowledge of French. (29.0)
The details of the scandal are now common knowledge. (35.2)
Her knowledge of English grammar is very extensive. (61.2)