本句中不是as if用的不恰当,而是其它语法错误.
I never deem cats are animal,they are geniuses,as if they could understand what the humans are thinking of.
1.as if 引导的是从句,不用“.",
2.as if 引导修饰性的和形容性的成分时,要用虚拟.
3.引导可能发生的事情时,用陈述语气.如:The clouds are gathering,as if it is going to rain.