Sentence:  He also bought a huge square of pegboard for hanging up his tools , and lumber for his workbench , sandpaper and glue and assorted nails , levels and T squares and plumb lines and several gadgets that he <WSD>had</WSD> no idea how to use or what they were for . 
Meaning of the word marked with <WSD> tags:  have or possess, either in a concrete or an abstract sense