I will take my laptop with me to the meeting ___ if nessary if it is necessary 是不是都对的?I will take my laptop with me to the meeting ___ if nessary if it is necessary是不是都对的?为什么?

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I will take my laptop with me to the meeting ___ if nessary if it is necessary 是不是都对的?
I will take my laptop with me to the meeting ___
if nessary
if it is necessary
是不是都对的?为什么?

都是对的,其实if necessary就是 if it is necessary的省略形式.
这种省略it is的写法很常见,比如:
if (it is) possible
if (it is) true
if (it is ) needed

感觉都是对的。不过when necessary更好。