call
[误] Ill call at Mr Brown.
[正] Ill call on Mr Brown.
[误] Ill call on Mr Browns home.
[正] Ill call at Mr Browns home.
[析] 作拜访讲时,at后面接访问地点,而on后面接访问的人。
call on drop in visit
call on比较正式的为公务的访问,如:We were called on by the old students. 而drop in则是比较随便的走走,顺便拜访,如:If youre free, drop in. 而visit则是更正式的外交访问或友好往来,如:My schools headmaster will visit America next week.
can
[误] A blind man can not judge colours.
[正] A blind man cannot judge colours.
[误] I cannt call for you at ten.
[正] I cant call for you at ten.
[析] can的否定形式应为cannot或cant.
[误] Its only six oclock. That mustnt be the postman.
[正] Its only six oclock. That cant be the postman.
[析] must用来表示一种肯定的推断,如:She must have some problems. She keeps crying. 但在否定句中则要用cant, 要表示对过去的推测则要用must+have+过去分词的表达法,如:The lights have gone out.A fuse must have blown.而对过去的否定推测则多用cant+have+过去分词,如:I dont think he can have heard you. Call again.
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