I just finished a PT that made use twice of "it is," in english to convey logic, in one SA question. This indicator is not in the CC and honestly, thinking about if the word following "it is" was necessary or sufficient slowed me down drastically.
"it is" is a group TWO indicator. This might be intuitive for most people but it definitely was not for me. My uncertainty was compounded when the context of the statement was "It is imprudent to appear prudent." Of course, finding the conditionality is a lot easier when the statement is "it is good to go outside," but I wanted to share what I have learned in hopes that others will not be thrown off if you happen to come across this indicator in the future!