Expand, please. Exactly WHAT are you asking?
Are they in a different language than one you read & write?
Are you asking if anyone has already converted those modules?
My best idea (if you don't want to just rewrite them) is to find a 2nd to 3rd conversion guide (1st and 2nd should be close enough to use that) and then a 3rd to PF converter.
But first search here by the module titles to see if someone else has done any of the work already.
The best way is to leave as much as possible and just do the stat blocks you need.
Most previous edition monsters exist in PF or have been translated elsewhere-- look for the monster stat block in the PRD and if it's not there google search "Monster name pathfinder" and you will usually find a blog with an acceptable translation.
Then all you have to do is to convert the NPCs villains that you need stats for.
I have been doing a direct transliteration of their ability scores unless there is a major mismatch and assume the every four levels progression is accounted for that (making adjustments as need be to meet feat requirements).
Then I try to match the NPC to the flavor-- if it's a swashbuckling type that in AD&D had the "fighter" class I might use a Fighter, or a Swashbuckler, or a Duelist-- basically whatever is a cool build that fulfills the role/purpose.
What modules are you looking at?
I've ported 3 AD&D1 modules to 3.5, which is not too far from PF, mostly I just converted the monsters by using the updated version and fixing the HP as per their variation from the average for this or that monster. I noticed that the result implied use of MUCH more powerful player characters in the 3.5 version than in the original (original was targeted at lvl 8-12 characters, lvl 12 was the absolute minimum to enter the updated version, and the top module included some CR 20+ encounters).
I must admit I used my instinct a lot in converting the DCs etc for traps, secret doors and the like.
And I'm getting antsy about PF2... the ease of conversion between PF1 and AD&D 3.xx was a major good point, helping conversion of old material to the newer system, and of newer material to the older one... no way PF2 will be so easy to convert with D&D, whatever the version, even 5... makes me wonder if I'll convert, given I've got a lot of old stuff, and little budget for new stuff.
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And I'm getting antsy about PF2... the ease of conversion between PF1 and AD&D 3.xx was a major good point, helping conversion of old material to the newer system, and of newer material to the older one... no way PF2 will be so easy to convert with D&D, whatever the version, even 5... makes me wonder if I'll convert, given I've got a lot of old stuff, and little budget for new stuff.
I've you ported AD&D1e modules to 3.5, you should have no problem converting PF1 content to PF2.
I'll need to wait for PF2 to be published in dead tree format to study it properly, an d I suspect the conversion from AD&D to PF2 might need a 2 step process, via D&D3/PF1... as it stands, I can't tell.