Structurally yes, dashes can be used like that to separate/add information, much like the commas as in the article. Though there’s two ways of punctuating them, either as spaced ‘n’ dashes (–) or an unspaced ‘m’ dash (—).

Is this a proper use of a dash.

Then I would fall back against the wall(all while making crashing sound effects) and she would-in slow motion- roll down the stairs with her hands still out reaching for me.

Hi Suman,

These questions aren’t really appropriate to this post and I can’t consistently answer so many specific sentence queries. I would ask with queries like this that you provide your own thinking, to show where the confusion lies, to cover broader topics rather than particular sentence-level questions.

On the object of prepositions query, for example, do you have examples? Have you considered it in context of my Word Order/Sentence Structure posts?

No, this is okay; though not necessary/typical the commas can be used in this way to slow down the pace of the description.

1.Service validity expired

2. Service validity has been expired.

Thanks for your help !!

Object of preposition can be subject of a sentance ?

The man, slowly and very carefully, opened the door.

error in that sentence?

Do you mean this sentence in particular? It would be better either separated in two sentences or with a conjunction as it’s not appropriate to separate these with a comma. I.e. “Could you please check? I have updated that.” or “Could you please check, as I have updated that?”

can I write that ?

please check