What can't Word find this grammatical error?

[aamixy]

If I type something like this: "This approach need to be further
investigated to understand ...",
and did a spelling check, Word didn't give any information. It should
be 'needs'. I double-
checked the settings for the spelling check, everything is set to be
checked.

I am not a native speaker. So grammatical errors usually happen. I repy
on Word
for some basic error checking due to typos.

Is there anyway that Word can correct this?

 

[Opus]

It seems to be a problem with the relationship between the noun "approach"
and the verb "need". It appears that Word is seeing "approach" as an
adjective and "need" as a noun, which would then be correct if a bit
nonsensical. If you change "approach" to some adverb such as "hardly", the
noun-verb agreement error is flagged. Moreover, if you change "need" to
"want", the error appears. But using "This approach need..." just will not
flag as a mistake though it clearly is. There is almost certainly no way to
correct this behavior in this case.

Grammar checkers, like spell checkers, are going to produce false positives
and false negatives. That is why one cannot expect to rely on them solely
for validating grammar or spelling.

Opus