1.You sound like something's bothering you, Susan.

表示对某人的关心。

2.That's not it.

对别人的说法表示否定。

3.I need your advice on a personal matter, but it's not about me.

向别人请求建议，而且是以比较直接的方式表达出来。

4.It won't sound like a big deal, but it is.

a big deal是指一件大事。sound like听上去像。

5.Shall I call Mr. Marchetta for you?

咨询某人意见。

6.I have an idea that may solve the problem for him and help a lot of other people.

that may solve the problem……是定语从句，修饰idea。一般情况下idea后面可以跟that引导的同位语从句。区分这两者的办法是，idea后面的从句是idea的具体内容时，是同位语从句，对其做补充说明，更加完整。后面的从句起修饰作用时，是宾语从句。