Помогите сделать задание по английскому пожалуйста не могу понять как делать​

Ответ: a. We've been learning; have already been b. Has come; is studying c.takes, leaves, returns d. Is ringing e. I am calling, has already been solt f. Think; I've been thinking, it will take g. What time will we leave h. I'm trying I. He has been late; I have never met j. Flow k.is doing; will return

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