once, twice, three times 等次数的的表达法这三个词都表示次数，once 是一次， twice 是两次。除了一次，两次，其他的次数都表达成基数词+times ，time就是次数，three times 是三次，五次就是five times , 这些表示次数的词后与一段时间连用，表示动作多长时间发生几次，即动作的频率。once two weekstwice a yearfour times a month表示频率的词还有every day , 每天， ev ery other day , 每隔一天，他们通常都是how often 句式的答语。—–How often do you watch TV?—–I watch it three times a week .—–How often does he go to see his grandpa?——Twice a week.

—How often do you eat vegetables?—Every day.