【小题1】They will have an English exam in a week .（就划线部分提问）
How soon will Were you having While landed they have an English exam?
【小题2】I was having lunch when the UFO landed.（变一般疑问句）
walks to spent writing lunch when the UFO landed?
【小题3】The boy was walking down the street when the UFO landed（改为同义句）
the boy was walking down the street, the UFO .
【小题4】He goes to school on foot every day .（同义句）
He school every day.
【小题5】It took Tom an hour to write to his friend. （同义句）
Tom an hour to his friend.
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解析：此题重点考查各种时态的各种句式结构之间的相互转换及重点短语。
【小题1】in+段时间表示多久以后是将来时间，就这一部分来提问一定要用how soon。
【小题2】考查过去进行时的一般疑问句的句式结构。
【小题3】考查when和while引导时间状语从句的区别。
【小题4】考查短语walk to=… on foot,
【小题5】spend， take 在表示花费时区别。