你好.at this time - - - -中的介词at通常省略.
A过去进行时
This time yesterday John and I were talking on the phone.
2 This time last Friday, when I arrived in Shanghai, my friends were waitng for me at the airport,
B将来进行时
1 Kate and Mary will be discussing their problem this time tomorrow.
2 This time next Friday,by which time / by when Tom will have arrived from Africa, he will be telling us about his new experiences in the jungles there..