... and VL in gratitude expressions .70………………Graph 1 Use of sub-acts with respect to + P (sit 1, lecturer) .…… ………… 46 ………Graph 2 Use of sub-acts with respect to + P (sit 2, speech) ……… . .48 ………………Graph ... sub-acts with respect to + P (sit 1, lecturer) ...…………… … 46 ……Table 5 Use of sub-acts with respect to + P (sit 2, speech) ……………… . 48 ………Table 6 Use of sub-acts with respect to = P (sit 6, money) ... FTAs .. 14 ……………………………………Table 2 Mean ratings of social factors by English subjects ……… 35………………Table 3 Mean ratings of social factors by English and Vietnamese subjects .. 36……Table 4 Use of...