The walls in my bedroom need painting. / The walls in my bedroom need to be painted.

I'll never forget going to that beautiful beach on Crete. / I forgot to go to that beach on Crete you told me about.

The lecturer went on to give examples of human activities that cause global warming. / The lecturer went on giving examples for another five minutes of human activities that cause global warming.

On his way to the gym, Kevin stopped to buy a plastic bottle of water. / Kevin stopped buying plastic bottles of water because they're not eco-friendly.

Oil spills are not easy to clean up. / Cleaning up oil spills is not easy.

I meant to stay up all night and wait for you, but I was so tired I fell asleep. / I am going to finish this, even if it means staying up all night to do so.

I like taking part in plant-a-tree events. / I'd like to take part in a plant-a-tree event.

I started to make my own handmade soap when I found out how harmful to the environment most commercial soap was. / After finding out how harmful most commercial soap was to the environment, I started making my own handmade soap.

It seems that simple changes in our everyday lives can help slow climate change. / It seems that simple changes in our everyday lives can help to slow climate change.

I regret to tell you that I can't reveal anything since it's a secret. / I regret telling you my secret, since you told everyone.