怎么把这些英语句子改为单数,急.
问题描述：
怎么把这些英语句子改为单数,急.
These are books
These are quilts
Those are oranges
Are thiese your watches?
Are those his dictionaries?
They are maps
Those are his rings
答
this is a book
this is a quilt
that is an orange
is this your watch
is that his dictionary
it is a map
that is his ring