Phân tích tư tưởng của nhân dân qua đoạn thơ: Những người vợ nhớ chồng… Những cuộc đời đã hóa sông núi ta trong Đất nước của Nguyễn Khoa Điềm
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Mark has spent three hours playing a computer game. He's been sitting there for three hours.
It was two o'clock when Mark started the game. He's been playing since two o'clock.
Three hours have passed since Mark and Sarah got up from the lunch table. They finished their lunch three hours ago.
B For and since with the present perfect
We often use for and since with the present perfect to talk about something continuing up to the present.
FOR SINCE
We use for to say how long something has continued. I've been waiting for forty minutes. We've known about it for two days. Melanie...
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Oxford practice grammar with answers part 31
