I'd guess that Ms Chen is almost sixty中I'd 指的是had还是would怎么解释

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I'd guess that Ms Chen is almost sixty中I'd 指的是had还是would怎么解释，有什么特殊的用法及说明吗？
这是外研社版的高一英语必修1 Module2 My New Teachers 中第二段的第一句话，查了一些资料，只有牛津字典里出现类似的段子：
I'd guess that she's about 30.
我估计她大概30岁。
我非常想知道原因，希望广大英语爱好者能够指点迷津，感激不尽！

would
如果是had，那么两种可能，一个是had + done，这里显然不对，
要不就是 had better do sth，而且 had better 不能分开，这里又不对
would guess，其实就是 guess，没什么区别
我们举例，I'd like to have a cup of tea.
= I would like to have a cup of tea.
= I like to have a cup of tea.

I'd guess that Mrs Chen is almost sixty . 英语翻译I'd guess that Mrs Chen is almost sixty .She's very stri 怎么区分I’d 是I had 还是I would i'd rather 的'd是 had还是would I’d 是I would fail?还是I had fail? "i hope she'd be very happy".这里的" 'd " 是had还是would?为什么? 虚拟语气中'd怎么区别是had还是would? I'd bettle hit the books!这句话中的I'd 是I had I would还是 I should? I'd 是指I could 还是I would? i'd better是i had better还是i would better I'd like you to do me a favor这里i'd 是i would 还是i had I'd like to go by train.中的'd是would还是had