Question

i want to find a partner to practice roller skating 这句话后面是不是

Answer 1

对,要加介系词with,因为前面已经提到伙伴,所以是“和”伙伴一起学溜冰,这是动词不定式作定语,介系词是必不可少的,又如：

I have my parents to take care of.

I need a knife to cut it with.

希望我能帮助你解疑释惑.