What are the people doing?
Say what the people are doing! Use Present Progressive.
Look! The boy is cycling on a single trail.
The man in the red jumpsuit is flying at over 60 miles an hour down the mountain!
Are they fighting now? - No they are playing rugby - the toughest sport in the world!
The people in picture 4 are climbing a mountain wall.
If you like water sports you can go canoeing. Look these people aren't surfing.
In the last picture the family is camping. They are sleeping in a tent!
Do you know these activities?
Don't mix them up!
Biking is a good way to keep fit. Mountain biking is a sport where you go down mountains on a steep trail.
If you buy glass bottles you can recycle them - to cycle means to ride a bike.
You build a house but you put up a tent.
A house has got walls but some mountains have some, too.
If you are outdoor you are in fresh air - indoors it's inside your house.