Переведите в англ. язык 1)смотри!мальчики играют в хоккей 2)сейчас,он играют в компьютер 3)она играет на пианино 4)мальчики не играют в футбол,они плавают.

Here are the translations into English, using the appropriate grammatical tenses for each situation:

1. Look! The boys are playing hockey.
   (The Present Continuous tense is used here because the action is happening at the moment of speaking, prompted by the word "Look!")
2. He is playing computer games now.
   (The Present Continuous tense is used to indicate an action happening right "now." Note: In English, we usually say "playing computer games" or "playing on the computer" rather than just "playing computer.")
3. She plays the piano.
   (The Present Simple tense is used here to describe a general skill or a regular activity. In English, the definite article "the" is required before musical instruments.)
4. The boys aren’t playing football; they are swimming.
   (The Present Continuous is used for both parts of the sentence to describe what is and isn't happening at this specific moment.)