Google Docs finally gets a grammar checker that is able to handle confused words (like "affect" and "effect"), wrong tenses, incorrect use of commas and clauses, and more. To do all this, Google will rely on machine translation – the same technology used to translate between multiple languages. Except for translating a sentence from, say, French to German, it sounds like it translates your incomplete text into a grammatically correct passage.
Details of what the grammar checker can do exactly and how AI will work are now limited. All we really know is that Google is already very well capable of translating machine translation ̵
However, adding an AI component to a grammar checker is not a new idea. A major competitor, Grammarly's keyboard and browser extension, also says it uses "a sophisticated artificial intelligence system" to analyze each sentence.
The grammar checker will not be available immediately everywhere. It is first launched for business users and must be enabled by a company administrator for users to test. You will be able to start with it today; Google did not say when the feature will be released for customer accounts or which languages would support the feature at startup.
In addition to the grammar checker, Google has also announced today that it will enable its Smart Compose feature from Gmail for business customers. The feature, which basically completes entire sentences based on the context of your email, was made public in May as an "experimental feature". Google now says that it will be available to G Suite users in the coming weeks.