Вариант 1 (Согласие):
A: Isolated spread footing is the cheapest type of foundation.
B: Without a doubt...
A: It is quite easy to choose the most suitable type of foundation.
B: Definitely!
Вариант 2 (Несогласие - пример):
A: Isolated spread footing is the cheapest type of foundation.
B: I don't think so... My view is that...
A: It is quite easy to choose the most suitable type of foundation.
B: I really don't believe that...