You've been playing tennis since you were a child., to talk about an activity that started in the past and is still continuing, e.g., We've been waiting since this morning., l've also read the book., to talk about a past action with no time reference, e.g., I've lost my glasses., I've been thinking a lot about this recently., to talk about a recent activity which continued for a while (and will likely continue into the future), e.g., l've been reading a lot of good books lately., I've lived in Kenya myself., to talk about an experience at some unspecified time in your life, e.g., He's climbed Mount Everest.

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