[正] The students dropped their voice.
[析] drop与fall都可以表示落下、掉下之意,有时可以互换,如:The dictionary fell (dropped) from the table. 但drop还可以作及物动词,而fall一般只能作不及物动词。
[误] I shall drop in you.
[正] I shall drop in on you.
[析] drop in是随便拜访某人,而其后要接人时应加介词on再加人称。
during
[误] During I was sick,I couldnt eat well.
[正] While I was sick,I couldnt eat well.
[析] during后不能接从句,而when和while后可接从句。
[误] I have been studying English during three days.
[正] I have been studying English for three days.
[析] during不能表达一个动作持续多长的时间,而只能表达在某段时间内某事件的发生。即带有由during引导的时间状语的句子只能用过去时,不能用完成时。
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