We'll need about 20 chairs, I should think.

　　我看我們需要大約20把椅子。

　　Can we make space for an extra chair?

　　我們能不能騰個空再放一把椅子？

　　I stood the little girl on a chair so that she could see.

　　我讓小女孩站到椅子上，好讓她看得見。