[解析]
W:How often do you exercise?Tina?
M:I keep running every day.
W:I go swimming once a week and I play ball games twice a week.
M:Question.
W:How often does tina go swimming?
M:How often do you exercise?Tina?
W:I keep running every day.
M:I go swimming once a week and I play ball games twice a week.
W:Question.
M:How often does tina go swimming?