... classifying and analyzing the features of PAs in both languages such as: surveying, notifying, confirming, introducing, explaining, drawing the H’s attention, promising, judging and checking judgement, ... expressing wishes, commenting, expressing feeling, demanding, blaming oneself for the mistake, suggesting, soothing, warning, reminding an experience, begging, making conditions, persuading and ... the form of statement produced in a rising intonation. However, the syntax of tag questions in English is clearer than that of questions ending with modal particles in Vietnamese. Moreover,...