would have to用法

I would have to say that is an 'L'-shaped bracket.---《老友记》第一季 第一集

我只能说这是个“L”型托架。

网上找的答案

①
would have to用于虚拟语气,用于主观情感不是很强烈
will have to用于将来时，与would have to比较，更显示主观性
have to用于现在时，用于客观必须要作的，相对于主观的must .
通过例子来帮助你理解：
I have to go for my sister is waiting for me.
是因为别人等你的客观原因你需要走

I must have dinner for I am very hungry。
是因为你肚子饿的主观原因才去吃饭的。

以下情景是员工答复老板：
I will do the job well.
(双手握紧)，自信而肯定地对老板说
I would do the job well.
(低着头)，缺少自信，似乎是应付地对老板说

②

would have to是"有必要去.."语气客气
will have to是"将会去做(必须)"语气带命令,用于上级对下级,老师对学生
have to是"应该去"用于自己对他人解释时说的