I.1. Our classes usually begin at 8.30 in the morning.2. The first lesson hasn't begun yet.3. I spent my last weekend well.4. I think we'll travel to the seaside next summer.5. The pupils are having a break now.II.1. My mother bought a lot of bananas yesterday.2. We have just eaten all the bananas.3. I think she'll buy some more bananas tomorrow.4. Usually my dog doesn't eat fruit.5. My dog is eating meat now.III.1. We have never swum in the ocean.2. We swam in the lake very often last summer.3. My friend will certainly swim in the Black Sea next month.4. We usually go swimming to the swimming pool.5. Look at the boys! They are swimming on such a cold day.