"a kind of" = "a type of" "It's kind of difficult to explain" "It's kind of you to invite me" So, your 1st sentence is incorrect.
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yanxIt's kind of a knife which also can be used as a screwdriver.This is about similarity.
yanxIt's a kind of knife which also can be used as a screwdriver.This is about classifying.
CalifJimyanxIt's kind of a knife which also can be used as a screwdriver.This is about similarity.It's [kind of / sort of / like / similar to] a knife which ...yanxIt's a kind of knife which also can be used as a screwdriver.This is about classifying.It's a [kind / type / sort / class / category] of knife which ...Example: Carob has kind of a chocolaty taste, but it is no