My school was closed due to snow today. I attempted to express that fact in Lojban (with a few extras), but got stuck on describing that kind of "closed". There are two other words for different senses of the word ({ganlo} = closed passageway; {tolgubni} = closed group/source &c), but there's a bit more to a closed school/shop than the windows and doors being closed.
Although it's not a totally satisfactory solution, you can simply use {na}.
.i ri'agi snime carmi gi na ckule "Because of the snow, there was no school." (Now, to actually say that it was cancelled, you could use {sei lo jatna cu jdice} in the second bridi.)
.i ze'a lo nicte na zarci (This one is weirder:) "When it's night, it's not a store." This might seem a bit weird, but it makes sense. A store that's closed is a store you can't buy from, and is thus not a store anymore. This about it though, what I actually said for the school is "With-physical-cause snow, it's not a school."
.i mi'e la tsani mu'o