Hello, could somebody help me how to write the following Excell quotation in Band Math?

=IF(NDVI<0;0.98;IF(AND(NDVI>=0;NDVI<0,2);0.92;IF(NDVI>0,5;0.99;0.92+(0.99-0.92)*Proportion_Vegetation)))

I tried this one, but it didn’t worked out because it says ‘unexpected keyword if’, because i guess it’s missing the ‘else’ from the ‘@ if @ then @ else @’ Operator:

if NDVI<0 then 0.98 or if NDVI >0 and NDVI < 0.2 then 0.92 or if NDVI > 0.5 then 0.99 else 0.92 + (0.99-0.92) * P_v