If I do this test, I will improve my English.
If I find your ring, I will give it back to you.
Peggy will go shopping if she has time in the afternoon.
Simon will go to London next week if he gets a cheap flight.
If her boyfriend doesn't phone today, she will leave him.
If they don't study harder, they won't pass the exam.
If it rains tomorrow, I won't have to water the plants.
You won't be able to sleep if you watch this scary film.
Susan won't able to move into the new house if it isn't ready on time.
She will stay in London if she gets a job.
I will buy a new dress if I have enough money.
She will take a taxi if it rains.
1) Everyone can contribute. 2) "Make a Difference" Day happens on the fourth Saturday of October every year. (V) 3) Last year, 3 million people volunteered on that day by doing different charity projects. 4) You also can make your contribution to the day by cleaning your local park or visiting an elderly person. 5) Help with collecting clothes or food for those in need. 6) Making donations to charity is also very important. 7) The project can be large or small - make a difference on "Make a Difference" Day! (V)
I have passed my exam today.
Используем Present Perfect потому что человек сообщает о результате, о опыте который он сделал. Который произошел. Его спрашивают есть ли у него этот опыт и результат от этого. И он сообщает что да у него есть результат. Он сдал свои экзамены.
Надеюсь понятно.