I tried giving up chocolate (it was no problem to stop eating chocolate) but it didn't make me feel more healthy.
I tried to give up chocolate, but it was too hard. I always ate some when my friends offered it to me.
It was too hot in the room. I tried opening the window (it was easy to open the window). It didn't help though, because it was very hot outside too.
I tried to open the window, but I couldn't because it was stuck.