As a matter of fact, As a matter of course, As a matter of principle, As a matter of law, As a matter of urgency, As a matter of record, As a matter of policy, As a matter of custom, As a matter of necessity, As a matter of routine, As a matter of discretion, As a matter of interest, As a matter of safety, As a matter of convenience, As a matter of priority, As a matter of public concern, As a matter of fairness, As a matter of security, As a matter of obligation, As a matter of interpretation, as a matter of phrases & idioms, C1 & C2 grammar, C2 grammar, C1 grammar, inverted sentences, advanced conditionals, the subjunctive mood in English.
