... (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 ... sub-acts with respect to - R (sit 1, sit 9, sit 11) .. . .63 …………… ……Graph 8 Use of sub-acts with respect to - R (sit 2, sit 6, sit 12) ……………... .66 …… ... subjects .. 36 …Table 4 Use of 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...