I should say... 我得说……
1. What do you think of the city? It's very busy and crowded, I should say. 你觉得这个城市怎么样？我得说，这是个非常繁忙拥挤的城市。
2. I should say it's really beyond my expectation. 我得说这确实出乎意料。
3. Well done, I should say. 干得好，我得说。
A: Do you know that scientists replicated a sheep into an identical clone.
B: I heard about that. It was successful.
A: It's a big jump in science. Maybe more like a leap.
B: I should say, it stunned me. I can't imagine what they will think of next.