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sons daughters twins children
F= Xi Ye+ XeYi F=XeYi-Xi Ye F= XiYi +XeYe F= Ye- Y i
He is a teacher He's tall He's Jim He comes from America
斜线终点坐标（Xe，Ye），当︱Ye︱>︱Xe︱时，计数方向取GY 斜线终点坐标（Xe，Ye），当︱Xe︱>︱Ye︱时，计数方向取GY 圆弧终点坐标（Xe，Ye），当︱Xe︱>︱Ye︱时，计数方向取GY 圆弧终点坐标（Xe，Ye），当︱Xe︱<︱Ye︱时，计数方向取GY
has borrowed has lent has kept lend
has borrowed has lent has kept lend
does;have do;have does;has do;has
When How How long How far
passed…by turned …down ended …up deal …with
does; has does; have do ; have is ; have
three times; a second twice; a third twice; third
three times; second
Three；second Third；second T
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