能不能说this year ago.this week ago.this month ago?

能不能说this year ago.this week ago.this month ago? we've been friends_____we came this school a year ago I am thirteen years old this year.(用two years ago代替this year He left this city last month.(用since a month ago 改写） this company_____he worked two years ago? this the school___I studied three years ago i wonder how long ago this school_____. He`s bought this backpack since half a month ago.(同义句） a month ago .i came to beijing .when i got.to this school ev The things talked about in this report () over a year ago He left Chine five years ago He bought this book last year H the things talked about in this report __over a year ago