

1. Although Richard is competent in his work, he does not know how to deal with this client.
=> Competent as Richard is in his work, he does not know how to deal with this client.
Tại sao câu này phải có "as" vậy ạ?
=> Competent as Richard is in his work, he does not know how to deal with this client.
Tại sao câu này phải có "as" vậy ạ?