问题标题：
把单数改成复数,把复数改成单数说明理由ThisisabookThatisaboxArethoserulersWhatarethese?TheyaretoysThatisaneggWhat'sthisinenglish?Yourbokisn'tinthedeskIsityourschoolbag?
问题描述：
把单数改成复数,把复数改成单数说明理由
Thisisabook
Thatisabox
Arethoserulers
Whatarethese?
Theyaretoys
Thatisanegg
What'sthisinenglish?
Yourbokisn'tinthedesk
Isityourschoolbag?
施红回答：
ThesearebooksThoseareboxesisthatarulerWhatisthis?itisatoyThoseareeggsWhataretheseinEnglish?Yourbooksaren'tinthedeskaretheyyourschoolbags?
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