Before class, I was nervous about this report.在上课前，我因为报告的事特别紧张。
be nervous about表示“因..….而紧张”，about是介词，后接名词或者动名词。
l am nervous about seeing her every time.每一次我一见到她就紧张。
l am a little nervous about the English test next week.我对下周的英语测验有一点紧张。

give sb. confidence to do sth.给某人做某事的信心
Ms. Liu always gives us confidence to speak English刘老师总是让我们有信心开口讲英语。
confidence的形容词形式为confident,意为“有信心的”。
Now he feels confident.现在他感觉充满信心。She is always confident.她总是充满信心。