2、 用can和could表达现在和过去的可能性(常用于疑问句和否定句)；

1、 用can和could表达现在和过去的能力；

30、Mrs Lu was very grateful for Zhao Aijia’s help. 陆夫人非常感激赵艾佳的帮助。

29、I would like to recommend Chen Dan for the Grade 7 Most Helpful Student Award.

28、Don’t leave the stove on. 不要让炉子开着。

27、That sounds dangerous. 那听起来很危险。

26、Thank you for joining us this evening.

25、Sandy may not be able to come.桑迪可能来不了。

24、I want a person to teach the children how to dance.我想要一个人来教孩子们跳舞。

23、We look forward to hearing from you soon.我们盼望着尽快收到你的来信。