The first parameter of infl

The first parameter could only be left blank if the language is English, otherwise the surrounding element wouldn't have the lang parameter set. {{{{{1|en}}}/script}} would probably work.

That would work if people are typing {{infl}}, but does anyone ever type (say) {{infl||verb forms}}? (I wouldn't have thought so, but I wouldn't have thought anyone just typed {{infl}}, either . . .)

I doubt anyone would leave {1} blank but specify {2}.