have
command
Unfortunately, I don't have a good command of the Greek language.
She had a good command of a few signs, but she could not use finger-spelling at all.
Aristotle says the greatest skill a writer can wish for is to have a good command of metaphor.
She has an impressive command of the English language.她精通英语。
SMART Vocabulary: related words and phrases
Skill, talent and ability
ability
accomplishment
accuracy
acumen
adroitness
chop
endowment
functional skills
functioning
genius
gift
greatness
prowess
pyrotechnic
pyrotechnics
qualification
repertoire
repertory
speciality
workmanship