1. When there (be) a storm, our dog always (run) under my bed. if be 2. Tomatoes (be) better when they (grow) in the sun. 3. If it (be) sunny in the morning, I usually (go) running around the park. 4. If you (swim) in the sea in summer, the water (be) usually warm. 5. Water (become) ice when it (get) very cold. 6. If it (snow) in this country, they often (close) the schools.

1. When there is a storm, our dog always runs under my bed.
Explanation: In this sentence, we use the present simple tense "is" to refer to the state of there being a storm. The verb "runs" is in the present simple tense because it describes a habitual action that the dog always does when there is a storm.

2. Tomatoes are better when they grow in the sun.
Explanation: Here, the verb "are" is in the present simple tense to describe the general quality of tomatoes when they grow in the sun. The verb "grow" is also in the present simple tense because it refers to the general action of tomatoes growing when they are exposed to sunlight.

3. If it is sunny in the morning, I usually go running around the park.
Explanation: This sentence involves a conditional statement. The verb "is" is in the present simple tense to refer to the condition of it being sunny in the morning. The verb "go" is in the present simple tense because it describes a habitual action of going running around the park when the condition is met.

4. If you swim in the sea in summer, the water is usually warm.
Explanation: This sentence also contains a conditional statement. The verb "swim" is in the present simple tense because it describes the action of swimming in the sea, assuming the condition of being in summer. The verb "is" is in the present simple tense to describe the general quality of the water being warm when you swim in the sea during summer.

5. Water becomes ice when it gets very cold.
Explanation: In this sentence, the verb "becomes" is in the present simple tense to describe the process of water changing its state to ice when it reaches a low temperature. The verb "gets" is in the present simple tense to describe the action of water reaching a very cold temperature.

6. If it snows in this country, they often close the schools.
Explanation: This is another conditional statement. The verb "snows" is in the present simple tense to describe the condition of it snowing in this country. The verb "close" is in the present simple tense to express the habitual action of closing the schools when the condition of snowfall is met.