了解某人英文

know sb well

了解（知道得清楚） understand [ ‚ʌndə(r)'stænd]; comprehend[‚kɒmprɪ'hend]; acquaintance:了解事物发展的规律 understand the laws of development of things一位优秀的教师必须了解儿童。 A good teacher must understand children.你如果能正确和有效地使用一个字，你就了解它了。 If you can use a word correctly and effectively, you comprehend it.（打听，调查） find out; acquaint oneself with:了解国内外科学技术发展情况 keep abreast of current development in science and technology at home and abroad

Know sb就可以啦

know sth about sbunderstand sthhave sth in common with sb

know somebody well