Newly married couples often leave on their honeymoon before the wedding reception ends.
Question: They often leave on their honeymoon? What does that mean? Why used “on their honeymoon”? Can I say “they leave for their honeymoon”?
“…Can I say “they leave for their honeymoon”?..”
Yes.
Or you could say: “They often leave to go on their honeymoon…etc…”
(IMO These frisky beavers should have an evening reception - that way they could get a room right after the ceremony in the morning, and yet still be around for the whole of reception, thus not potentially offending guests.)
In my view, ‘leave for their honeymoon’ is better (and really, ‘leave on their honeymoon’ sounds not just worse to me, but wrong). But it would be ‘go on their honeymoon’.
Ah yes. Prepositions are always a pain in the neck when learning any language. I swear, these things are the hardest thing to master. The above posts give good recommendations, I was going to comment on it, but they already did a good job. Keep up the hard work, and eventually, these pesky conjunctions will begin to make more sense