Could you please check if the following sentences are right?
No sooner had lacy snowflakes started descending than my view became a twirling whiteness.
No sooner had colourful fall arrived than winter dethroned it.
The first flower had hardly bloomed before the whole garden exploded with vivacious colours.
Hardly had dusk matured into night when dawn announced a new day.
Since he lost his notes, he decided to present using the information off the internet.
Prior to the presentation he lost his notes, so he decided to present using the information off the internet.
Thank you very much
Hope