If you buy two books, you get one free
The menu appears on the screen if you press this button twice
If dogs eat chocolate, it makes them ill
if water freezes, it expands
If you heat water to 100 it boils
Ничего сложного здесь нет, просто в каждом предложении употребляешь present simple
1.have a meal
2.do homework
3.go on foot
4.have a good time
5.make a mistake
6.have a shower
There are three oranges in the fridge. В холодильнике лежат три апельсина.
What were you doing when it began raining?
He bought this car last month.
They were watching the film when it happened.