write + not + it's not that you can't do
kakanai koto wa nai
it's not that you can't do; possible after all, if reluctantly
meaning: can write after all
忙しいけど、手伝わないことはないよ。
isogashii kedo, tetsudawanai koto wa nai yo.
I'm busy, but I can help after all. casual
予算的に厳しいが、妥協しないことはない。
yosanteki ni kibishii ga, dakyoushinai koto wa nai.
Budget-wise it's tight, but we can compromise after all. neutral