Imminent
Occur
"Observe" means to watch something happen.
"REOCCUR"
bale
INFUTURO
no. hopeful means that if you want something to happen, then you are hopeful that it will happen. pity means if something bad happened, it would be a pity.
The word 'happen' means 'to occur' or 'to take place'. The word 'happen' originate from hap that is either hap the noun or the extended form of hap the verb.
iterate
Yes, "happen" can take the prefix "re-" to form the word "re-happen," which means to happen again or reoccur.
The word "predictable" contains a suffix "able" that means likely to happen.
simultaneous
The word betide is a verb. It means to happen to.