助动词提前
is this his bicycle.
are they my parents.
is Tom thireen year's old.
is there a book on the desk.
is she in my class.
is he Sue's(人名) brother.
is that my schoolbag.
is his teacher Mr Williams(人名)
助动词提前
is this his bicycle.
are they my parents.
is Tom thireen year's old.
is there a book on the desk.
is she in my class.
is he Sue's(人名) brother.
is that my schoolbag.
is his teacher Mr Williams(人名)