一、用should、could、shouldn't填空。
1. We go to the park this weekend, but we're not sure.
2. People talk on a mobile phone while they are driving.
3. He be at home now. He seldom goes out at night.
4. To improve your English, you practise speaking every day.
5. —I have a fever. Should I take some medicine by myself?
—No, you . You see a doctor first.

1. could
2. shouldn't
3. could
4. should
5. shouldn't; should

【分析】本题考查情态动词should、could、shouldn't的用法辨析，需结合句子语境判断语义：could可表示不确定的推测或委婉的可能性；should意为“应该”，用于提出建议或义务；shouldn't意为“不应该”，用于提出否定建议或禁止。逐个分析句子语境：1. 由“we're not sure”可知是不确定的可能性，对应could；2. 开车时打电话是不当行为，需用否定建议，对应shouldn't；3. 由“seldom goes out at night”推测大概率在家，用could表可能性；4. 为提高英语需提出建议，用should；5. 发烧不能自行吃药（否定建议），第一空填shouldn't，随后建议看医生，第二空填should。
【解析】1. 句中“but we're not sure”体现不确定的推测，could可表不确定的可能性，故填could；2. 开车时打电话是不恰当的行为，shouldn't表“不应该”，符合语境，故填shouldn't；3. “seldom goes out at night”说明他晚上很少出门，推测可能在家，could表可能性推测，故填could；4. “To improve your English”是目的，需提出合理建议，should表“应该”，故填should；5. 问句询问是否该自行吃药，答句先否定该行为，故第一空填shouldn't；随后提出看医生的建议，第二空填should。
【答案】1. could；2. shouldn't；3. could；4. should；5. shouldn't; should
【知识点】情态动词的用法，should与could的辨析
【点评】本题为英语基础情态动词应用题型，核心考查should（应该）、could（可能）、shouldn't（不应该）的语义理解与语境适配，属于初中英语基础考点，难度较低，适合巩固情态动词的基础用法。
【难度系数】0.8

二、根据要求完成下列各题，每空一词。
1. He should put some sugar into the coffee.（改为否定句）
He put sugar into the coffee.
2. May should exercise twice a week to keep healthy.（改为一般疑问句）
May twice a week to keep healthy?
3. You should drink some water with honey when you have a sore throat.（对画线部分提问）
I when I have a sore throat?
4. —Should he play football all the afternoon?（作否定回答）
—No, .
5. Frank could swim when he was five years old.（改为一般疑问句并作否定回答）
— Frank when he was five years old?
—No, .

1. should not; any
2. Should; exercise
3. What should; do
4. he shouldn't
5. Could; swim; he couldn't

【分析】本题考查情态动词should和could的句式转换，解题思路为：1. 情态动词变否定句时，直接在情态动词后加not，且否定句中some需改为any；2. 情态动词变一般疑问句时，将情态动词提前至句首，其余部分语序不变；3. 对动作提问用疑问词what，后接情态动词、主语及动词do（替代划线动作）；4. 情态动词开头的一般疑问句，否定回答为“主语+情态动词+not”的缩写形式；5. could的句式转换规则与should一致，仅情态动词使用could。
【解析】
1. 原句含情态动词should，变否定句在should后加not，否定句中some改为any，故填should not; any。
2. 原句含情态动词should，变一般疑问句将should提前，动词用原形exercise，故填Should; exercise。
3. 划线部分为动作，用疑问词what提问，后接情态动词should，主语I，用do替代划线动作，故填What should; do。
4. 问句为Should he...? 否定回答为he shouldn't，故填he shouldn't。
5. 原句含情态动词could，变一般疑问句将could提前，动词用原形swim；否定回答为he couldn't，故依次填Could; swim; he couldn't。
【答案】
1. should not; any
2. Should; exercise
3. What should; do
4. he shouldn't
5. Could; swim; he couldn't
【知识点】
情态动词用法；句式转换
【点评】
本题围绕情态动词should和could的基础句式展开，涵盖否定句、一般疑问句、特殊疑问句及回答，是初中英语核心基础语法考点，侧重对情态动词基本用法的掌握。
【难度系数】
0.8