Question

write the uses of present perfect tense in points ​

Answer 1

Answer:

Air is the invisible mixture of gases that surrounds the Earth. Air contains important substances, such as oxygen and nitrogen, that most species need to survive.

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Answer 2

• result of actions in the past is important in the present (It is not important when the actions happened. ...
• recently completed actions. ...
• states beginning in the past and still continuing – mostly with since (point of time) or for (period of time) ...
• together with lately, recently, yet.