User_gary I am have been using this book since last year. I am have been using this book since 2007. Some people in temple lie prone and extend their arms above their head s , having intertwined their hands.
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User_garyIamhave been using this book since last year.
Iamhave been using this book since 2007.
Some people in temple lie prone and extend their arms above their
No, with the "since 2007" you need the present perfect (have used), not the past perfect (had used). Unless you add something else, like "I had used this book since 2007,
You can also try this.
I had used this book since last year.
I had used this book since 2007.
You might need to take a look on past and present tense.