Y:If you don’t mind，I'd rather you didn't.I have a cold and feel chilly.
X:Oh，that’s too bad.Should I call a doctor?
Y:I’d appreciate it if you would.
1.If you don’t mind，I'd rather you didn't.
a.本句使用了“I would rather+that从句”的虚拟语气句型。
I would rather+过去时that从句
例:I wish she were here.
=I'd rather she were here.
It is a pity that she is not here.
I would rather+过去完成时that从句
= I wish+过去完成时that从句
例:I wish she had been here.
=I’d rather she had been here.
It is a pity that she was not here.
If you don’t mind，I'd rather(that)you didn't.
= If you don’t mind，I wish(that)you didn' t.
2.I’d appreciate it if you would. 如果你那么做，我将会感激你。
= I would appreciate it if you would call a doctor for me.
= I would appreciate it if you called a doctor for me.
I would appreciate it + if引导的过去时从句 若……，我将很感激。
例:Jack:I'd appreciate it if you would pick me up later.
Lily:OK.I can do that if you like.