It's a pencil box 复数改

It's a pencil box 复数改 It is a red pencil box.变成复数形式. Is's a pencil-box.改为复数句 It is a pencil-box. 改为复数句是什么? 它后面是______are_______. 这样的 It isn't his pencil-box?改成复数 is My ruler?—It‘s in the pencil box选一选,is My ruler?—It‘s in the pencil box选一选,A ,When B,Where C ,Why It's a box改为复数句快 It`s a big heavy box.变成复数怎么变 radio ,pencil box,的复数 the pencil box is purple还是the pencil box it's purple. It's his pencil box.改为否定句 it is a pencil box对划线部分提问 what's this?It's a box.怎么改成复数形式?下面几题也说下就是 pencil-box的复数形式是什么? that's a dark red box复数 That's a box变成复数形式 What ________in my pencil-box?There is a pencil,a pen and an easer in it. That's his pencil--box．（该为复数形式）