Well , what do you think of the new sales plan?

你认为新的销售计划怎么样?

Basically, I think it' s a good plan.

我想基本上可以。

What about the sales plan? Do you think they're realistic?

那些促销计划怎么样?你认为很实际吗?

Actually, I think they're a bit too optimistic.

事实上，我想有些太乐观了。

Yes, I suppose so.

是的，我也这样认为。

basically ad.基本上，从根本上说

optimistic a.乐观(主义)的