to know, know how to do (something) be aware of ☊ 
biết ☊ they (he, she) should know that, should be aware that ☊ hãy biết rằng ☊ they are aware that ☊ họ ý thức được rằng ☊ to be well aware (of something, that) ☊ thừa biết ☊ be aware of the reasons ☊ tri cơ ☊