Unlike "must," "have to" can be conjugated into different tenses (past, future, perfect).
The good news is that this is a finite set of rules. With regular review—especially using a visual reference like a PDF—you can master these in one week. Modal Verbs Of Obligation Prohibition And Permission Pdf
Downloading the PDF is just the first step. To truly master "Modal Verbs Of Obligation Prohibition And Permission," use the PDF with the following study method: Unlike "must," "have to" can be conjugated into
You are not allowed to do this.