? [误] I have to study on Saturday but I haven't to study a full day?
? [正] I have to study on Saturday, but I don't have to study a full day.
? [析] have to 不得不,而don't have to 为其否定式。
? [误] Is Tom in the classroom? No. He mustn't be in the classroom, because I saw him talking with our teacher in the office just now.
? [正] Is Tom in the classroom? No. He can't be in the classroom because I saw him talking with our teacher in the office just now.
? [析] must 加动词原形表达一种比较肯定的推测,而表示否定的推测则要用can't。
? [误] My grandpa is over eighty but he is able to read without glasses.
? [正] My grandpa is over eighty, but he can read without glasses.
? [析] can (could) 多用于表达客观的事实,主观能力,而be able to 则多用于表达主观的意愿。
? [误] She doesn't answer the doorbell.? She should be asleep.
? [正] She doesn't answer the doorbell. ? She must be asleep?
? [析] should 用于现在时态的句子中应译为应该,如:You should do your homework right away. 而 must加动词原形表示一种推测。
? [误] Do you like to go with us?
? [正] Would you like to go with us?
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