There is a glass of water in the picture.
There are many boys running on the playground.
There is a book in the teacher's left hand.
There are 30 students in my class.
There are 10 patients waiting in the line.
If you don't work hard,you will fail in the exam.
If you want to answer the question,please raise one of your hands.
If you were 20 years old,I would fall in love with you.
If you go to London next week,don't forget to bring an umbrella with you.
If you had arrived here 5 minutes earlier,you would not miss the train.