If I did agree是强调句吗?

不是强调句,是条件状语从句,
do/does/did +动词原形,表示强调,意为" 的确...; 确实...",但不是强调句
did agree只是强调谓动而已
意思:如果我确实同意...
下面这个才是强调句:It is/was...that ...
如:It was in the park that I saw him yesterday .
我昨天是在公园看见他的.