We ues glue for _____(stick) some cardboard boxes together.

We ues glue for _____(stick) some cardboard boxes together.
We ues glue for _____(stick) some cardboard boxes together.

We ues glue for _____(stick) some cardboard boxes together.
sticking
stick有动词"粘"的意思,这里需要用ing形式保持for doing sth.的词态

Stick
因为Stick是名词不是动词，在此句用来形容用胶水粘，for 后面加doing sth，stick不是动词所以不用加ing来表示正在做某事的状态。