根据图画内容，在横线上填入相应的动词开头的短语。

小词典：学会使用词典会让我们的英语学习事半功倍。以下是从字典上节选下来的条目，仔细观察然后归纳。

need(1)vt．需要 Do you need any help?

The boy needs a new pencil every day.

Does he need to go?

You don't need to walk here.

(2)v．aux．[主要用于否定和疑问句] 必须，必定

You need not go now.

No one need worry too much about it.

(3)n．必要，需要物 There is no need of worrying.

问题一：need有哪几种词性？分别是什么意思________

问题二：need的第一种与第二种意思用法有何不同？分别是什么意思________