... 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 sub-acts with respect to + P (sit ... (sit 1, sit 9, sit 11) ..… …… .. 63 ………Table 11 Use of sub-acts with respect to + P (sit 2, sit 6, sit 12) 65……………………Table 12 Common strategies by ES and VL in gratitude expressions .70………………Graph ... .…… ………… 46………Graph 2 Use of sub-acts with respect to + P (sit 2, speech) ……… ..48………………Graph 3 Use of sub-acts with respect to = P (sit 6, money) …… .………… …. 52……Graph 4 Use of sub-acts with...