Around 18 months ago, my cousin and I went camping regularly with a couple of friends in a large ancient forest. We would go in, set the tent up in the light and had a barbeque, then slept. We went several weeks running with the same routine, different friends each time. Until one night we decided to leave the tent and return later so we could get some more supplies. We returned to the tent at dusk, but found a stick figure made from twigs at the entrance of the tent. One of our friends, who reluctantly joined us on this occasion, turned strange. He disappeared into the woods, which we found strange as he was petrified on the way into the woods, and then we could hear nothing but singing for at least an hour. He eventually returned, and we continued to party until it started to rain heavily, at which point we decided to call it a night. We woke up in the morning and decided to pack the tent down.It eventually became obvious that the trees surrounding our tent had the same shape as the figure carved into the bark. We pretty much rushed to get out of there, and came across a still-burning pit of fire surrounded by fallen trees. That was the final straw, so we ran the remaining mile back to my car. What is the generic structure for the sentences above?

Question

Around 18 months ago, my cousin and I went camping regularly with a couple of friends in a large ancient forest. We would go in, set the tent up in the light and had a barbeque, then slept.

We went several weeks running with the same routine, different friends each time. Until one night we decided to leave the tent and return later so we could get some more supplies.

We returned to the tent at dusk, but found a stick figure made from twigs at the entrance of the tent. One of our friends, who reluctantly joined us on this occasion, turned strange. He disappeared into the woods, which we found strange as he was petrified on the way into the woods, and then we could hear nothing but singing for at least an hour. He eventually returned, and we continued to party until it started to rain heavily, at which point we decided to call it a night.

We woke up in the morning and decided to pack the tent down. It eventually became obvious that the trees surrounding our tent had the same shape as the figure carved into the bark. We pretty much rushed to get out of there, and came across a still-burning pit of fire surrounded by fallen trees. That was the final straw, so we ran the remaining mile back to my car.

What is the generic structure for the sentences above?