翻译&讲解下列句子Chris would be ironing a shirt.

（那时）Chris或许正在烫衬衫.
此处的would表对过去发生事情的料想或猜想,而用would+be doing,是对过去某个时间点正在发生的事情进行推测
给你一段关于will和would用法的归纳,
will和would的用法
1.表示请求、建议等,would比will委婉客气.如：
Would you pass me the book?
2.表示意志、愿望和决心.如：
I will never do that again.
They asked if we would do that again.
The door won't open
3.用“will be”和“will(would) + have + 过去分词”的结构表示推测,主要用于第二、三人称.前者表示对目前情况的推测,后者表示对已经完成的动作或事态的推测.如：
This will be the book you want.
He will have arrived by now.
The guests would have arrived by that time.
I thought you would have finished this by now.
4.Would可表示过去反复发生的动作或某种倾向.Would表过去习惯时比used to正式,并没有“现已无此习惯”的含义.如：
The wound would not heal.
During the vacation he would visit me every week.
5.表料想或猜想.如：
It would be about ten when he left home.
What would she be doing there?
I thought he would have told you all about it.

克里斯将熨衬衫。

我们平时在一定情况下说某人将要做某事会用到 Sb. will be doing sth.，比如 I will be reading books this time tomorrow.
而当will 变成would 常常是因为虚拟语气（表猜测），或者发生在过去之类的，比如 你所问那句应该是表示猜测的，CHRIS也许将要烫衬衫。
还有的情况： He said that Chris wo...

Chris或许在烫衬衫。Would表虚拟语气，或者语气轻微。