The last time my family went picnicking together was in 2021. -> My family have not gone picnicking together since 2021.

Matthew used to attend an army course, so he has become a disciplined person. -> Matthew has become a disciplined person after attending an army course.

"Who should I contact to book this eco-tour?" -> I asked my friend who I should contact to book this eco-tour.

I haven't bought any clothes since my trip to Hanoi. -> The last time I bought clothes was during my trip to Hanoi.

It's such a shame that it's raining heavily right now at the campsite. -> We wish the weather was better at the campsite right now.

Those hikers have never gone bird-watching in the forest before. -> This is the first time those hikers have gone bird-watching in the forest.

You can't register for a course abroad if you don't have a passport. -> Unless you have a passport, you can't register for a course abroad.

The children were very exhilarated when riding the roller coaster. -> The children found the roller coaster ride very exhilarating.

As kayaking is so relaxing, we all enjoy doing it every weekend. -> Kayaking is so relaxing that we all enjoy doing it every weekend.

You should wear hiking boots, or you may fall while climbing the mountain. -> If you don't wear hiking boots, you may fall while climbing the mountain.