Hi,

Are the following sentences natural to a native ear?

1. In the past, I (have) tried sending him emails using the publicly available address but never got a response. ( Is the ‘have’ required?)

2. I have good working knowledge of our organization structure and various business functions.

3. We see (the) potential for the group to grow its influence in the area. (is 'the' required?)

Thanks,
MG.