I found two examples, and I think that I got the meaning but I'm not sure of
its grammar. One is:"明日はお父さんも休みのことだし、 みんなで買い物でも行かない？" since tomorrow your
father is free too, why don't we go all together to do shopping?

The other one is the following:"来週は客様が来ることだし、家のなかの大掃除をしなくちゃ". Since the next
will be coming a guest we have to do the big cleaning in the house"
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2019-06-22T17:55:24.047
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2019-06-23T13:21:58.673
2019-06-22T21:23:42.670
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question
grammar particle-し
What's the meaning and the usage of ことだし？
Your understanding of the sentences is essentially correct :) but I'll just
provide a little more explanation to try and help and clarify the nuance.

ことだし is essentially an extension of the conjunctive 〜し, specifically the use
of し for listing causes/reasons. (There's a post on all the usages of
conjunctive 〜し here, if you aren't familiar with them:
<https://japanese.stackexchange.com/a/59151/33435>)

The difference between 〜ことだし and 〜し is that the reasoning is be marked as more
"objective" in the ことだし case. As a result, something with ことだし comes across a
bit more logical, and stiff/rigid in tone. On the other hand, for the case of
し without the ことだ, it is more relaxed as to the causal relationship being
implied.

I think because the causal relationship is fairly clear, your translation of
ことだし as "since" is good.

On your specific translation, I might consider changing how you translate 休み
and 大掃除 depending on context and/or to sound more natural:

> 明日はお父さんも休みのことだし、 みんなで買い物でも行かない？
>
> Tomorrow, since your father also has _a day off_ , why don't we all go
> shopping?
>
> 来週は客様が来ることだし、家のなかの大掃除をしなくちゃ。
>
> Next week, since there is a guest coming, we have to do _some spring
> cleaning_ / _a major cleanup_ of the inside of the house.

Hope that helps!
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answer