The contraction where'll is not universal. It is not used in the dialect of American …
where are you going是“你打算去哪”，where will you go是“你将要去哪”。 …
In speaking, will and shall are usually contracted to ’ll, especially after subject pronouns (I, we, you, they, he, she, it): …
’ll is also used for indicating decisions or arrangements where will or shall would …
We use where as a conjunction meaning ‘in the place that’ or ‘in situations that’. …
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