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辨析时间介词on，in和at 还有how often，how long和how soon every day和everyday 一共三组

1.on和in

“on”用于“具体的某一天“或者”“一个特定的时间”，或者是特定的早晨，中午下午，如on 1st October, on a rainy day，on the morning of his arrival

“in”用于“较长的时间”，如in the 1980s, in the morning

2.how often how long和how soon

“how long”指“多长时间”，主要用来对一段时间的提问，如how long have you known her?(你认识他有多久了), 回答是 for 3 days(三天了)

“how often”指“每隔多久”，主要用来对频度副词或状语的提问，如how often does he come here?(他每隔多久来?),回答是 once a week(每隔一周)

“how soon”指“再过多久”，主要是用来对将来时间的提问，如how soon will he be back?(他多久会回来?),回答是 in a week(一周内)

3.every day和everyday

“everyday”形容词：每天的, 日常的, 平常的, 平凡的例：a suit for everyday wear. 适合平日里穿的衣服

“every day”通常做“每天”解作状语时，省掉介词（in),表示频率。 I go to school every day.我每天上学 He exercises every day. 他每天锻炼