関連ワード:  is it correct to write sirs    is it correct to use sirs    is it ok to write sirs    is it correct to write dear sirs    is it correct to write dear sirs madams    is it ok to use sirs    is it ok to write dear sirs in email    is it correct to use dear sirs in a letter    is it ok to write dear sirs    is it correct to use dear sirs